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Verify the signature, the key that made it, and what the package will install before you approve a transaction. For packages from Arch repositories, pacman should stop automatically when a required signature is missing, unknown, or invalid. Local archives, AUR builds, and installation ISOs need additional checks because they do not all use the same trust store or verification step.
This guide separates those workflows and gives you a recovery path for the common “invalid or corrupted package (PGP signature)” error without weakening package security.
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What “verified” means in Arch Linux
Verification has two different goals:
- Integrity: the bytes you received match the bytes the publisher signed or hashed.
- Authenticity: the signature belongs to a key you trust for that project or maintainer.
A checksum can detect a changed download, but it does not by itself prove who created it. An OpenPGP signature addresses both questions only when the signing key has been obtained and trusted through the expected channel.
The checks you need depend on the artifact.
| Artifact | Primary trust source | Integrity mechanism | What you must inspect |
|---|---|---|---|
| Official repository package | Arch packager or developer key in pacman’s keyring | Pacman package signature | Pacman’s signature result, repository configuration, package metadata and file list |
| Local package archive | Expected publisher’s detached-signature key | Detached OpenPGP signature, when supplied | LocalFileSigLevel, signer fingerprint, metadata and installed files |
| AUR or locally built package | PKGBUILD author plus upstream release key, when available | Source checksums and optional upstream signatures | Every executable PKGBUILD function, source URL, checksum array and install script |
| VCS source or package | Maintainer’s recipe and the pinned upstream revision | Revision or checksum, depending on the recipe | Changing source, commit identity, generated files and build commands |
| Arch installation ISO | Arch release signer key | Detached ISO signature | ISO, matching .sig file and official release-key file |
These are separate trust decisions. A package that installs successfully with pacman -U is not automatically an official Arch package, and a clean checksum does not make an untrusted PKGBUILD safe.
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Prepare pacman’s keyring and signature policy
Initialize keys on a new installation
pacman-key manages the PGP keyring used by pacman to check signed packages and databases. On a new system, initialize it and load Arch’s keys:
sudo pacman-key --init
sudo pacman-key --populate archlinuxThe populate target shown above is the normal Arch target; use the target documented by your distribution if you are running an Arch derivative with a different key set. Keep the archlinux-keyring package current. An old keyring can make a current, valid package appear untrusted or expired.
Keyring maintenance is part of package verification, not an optional cleanup task. Pacman can only validate a signature when it has the relevant public key and can evaluate that key’s validity dates. If a newly installed system has never initialized its keyring, or if the keyring has not been updated for a long time, a failure may reflect local trust data rather than a malicious package. Diagnose that distinction without accepting an unknown key blindly.
Require signatures in pacman.conf
Open /etc/pacman.conf and check the global signature policy. The documented equivalent for requiring package signatures while allowing unsigned databases where configured is:
SigLevel = Required DatabaseOptionalA repository section can override the global setting, so inspect both the global option and each active repository block. With a required package signature, the absence of a signature or an invalid signature is a fatal error; pacman should not continue the transaction.
Repository-specific overrides matter when one repository behaves differently from the others. Read the section that supplies the package, not only the first global setting you find. Also check whether a third-party repository has its own documented signing key and policy; an Arch master key does not automatically authenticate unrelated repositories.
Do not change the policy to SigLevel = Never as a routine fix. That setting removes the protection you are trying to test.
Verify an official repository package with pacman
1. Keep the rolling system coherent
Arch is a rolling release. Update package databases and perform a full upgrade together:
sudo pacman -SyuAvoid partial upgrades, such as refreshing databases but installing only one library while leaving the rest of the system at an older state. Dependencies, package metadata and signing keys are maintained as a coherent set. A full upgrade also gives a stale keyring or mirror problem a chance to resolve through the normal repository path before you investigate a single package.
2. Confirm the signature result before approving
Install a repository package normally:
sudo pacman -S package-nameDuring dependency resolution and download, pacman checks the package signature against its keyring. Proceed only when pacman reports a valid signature from a trusted Arch packager key. Stop when you see any of the following:
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- the package has no signature even though signatures are required;
- the signing key is unknown or not trusted;
- the signature is invalid or the file is corrupted;
- the key is expired and the system’s clock and keyring have not yet been checked.
Do not accept an unfamiliar key merely because the package name looks right. Verify that the key belongs to the expected Arch project or packager through the project’s documented key information before changing trust.
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3. Understand what pacman’s check proves
A successful repository signature check establishes that the downloaded archive matches what the trusted signer published. It does not mean every file inside is harmless in an absolute sense; it means the package came through the authenticated repository release process. You should still review unusual packages, maintainer changes and file ownership when the package is security-sensitive.
Inspect a local package archive before pacman -U
Local installation is a different path from repository installation:
sudo pacman -U ./name.pkg.tar.zstFirst obtain the archive and any detached signature from the same trusted publisher or repository. A file attached to a forum post or copied from an arbitrary mirror is not equivalent to an official repository package. Keep the archive and its signature together while checking that their names identify the same version and build.
Check the local-file policy
Review LocalFileSigLevel in /etc/pacman.conf. Arch’s default behavior for local files may permit locally built packages without signatures. Therefore, a successful pacman -U transaction alone does not prove provenance.
If a detached signature is supplied, verify it before installation. A typical GnuPG check is:
gpg --verify name.pkg.tar.zst.sig name.pkg.tar.zstThen inspect the signer’s full fingerprint and confirm it belongs to the expected project or maintainer. “Good signature” only says the file matches that public key; it does not tell you whether the key is the one you intended to trust. Compare the fingerprint with the publisher’s documented key information through a separate, trusted channel.
Review metadata and the file list
Use pacman’s query mode without installing the archive:
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pacman -Qlp ./name.pkg.tar.zstThe first command displays package metadata such as name, version, architecture, dependencies and description. The second lists every path that the archive would install. Look for unexpected service units, hooks, shell profiles, writable system locations or files that replace commands you already rely on. Check whether the package installs a system service, a privileged helper or configuration under a directory you did not expect.
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These queries are inspections, not signatures. They tell you what the archive claims to contain and where it will place files, while the detached signature tells you whether the bytes came from the signer. You need both kinds of evidence before using a local archive.
Audit an AUR PKGBUILD or local build
An AUR package is a build recipe, not a pre-vetted binary. The security decision is made when you read and execute the PKGBUILD, usually through makepkg. The AUR host does not turn a recipe into an Arch repository package, and popularity or comments are not substitutes for reading the code.
Read every executable section
Read the complete file before running any command from it. Pay particular attention to:
source: every URL, local file and accompanying signature;sha256sums,b2sumsor another checksum array;prepare(): patches and generated files applied before compilation;build()andcheck(): commands that execute upstream or custom code;package(): the files copied into the final package and their permissions;- install scripts and hooks that can enable services, create users, alter configuration or touch data outside the package directory.
Investigate unexpected network downloads, shell commands assembled from variables, obfuscated text, prebuilt binaries, writes outside $pkgdir, and commands that read credentials or modify unrelated user data. A short recipe is not automatically safe, and a long recipe is not automatically malicious; the important question is what each command does. Pay attention to commands hidden in helper variables or functions inherited from sourced files as well as commands written directly in the visible functions.
Validate source checksums
For fixed release sources, every entry should have a matching checksum. makepkg uses the checksum arrays in the PKGBUILD to verify source-file integrity. Run the source verification before building and stop if a checksum changes unexpectedly:
makepkg --verifysourceDo not casually replace a failed checksum with a newly generated value. First determine whether upstream released a new archive, the URL now serves different content, or the recipe was tampered with. A checksum array is meaningful only when it covers every fixed source that the recipe downloads; an omitted source or a deliberate SKIP entry creates a separate trust question.
Use upstream signatures when they exist
When upstream publishes a detached signature, the recipe should include the signature file—commonly a .sig, .asc or .sign entry—in source. The validpgpkeys array should contain the complete expected fingerprints. This lets makepkg verify the upstream signature with your user PGP keyring.
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Recognize higher-risk recipes
SKIPchecksums: the listed source is not being integrity-checked by a checksum array, so you need another reliable verification method.- VCS sources: recipes ending in
-git,-svnor similar can fetch changing content. Check the repository, commit or tag the recipe selects and understand that a moving revision changes the code you build. - Generated or prebuilt content: binaries downloaded during the build deserve the same scrutiny as a package archive, including provenance and hashes.
- Changing downloads: a URL that serves “latest” content can produce a different build without a PKGBUILD change.
These cases are not automatically unsafe, but they require manual review of the exact revision or release and of any binary that bypasses compilation. Record the revision or release you reviewed so a later rebuild can be compared against the same expectation.
Build in a disposable directory and inspect the result
Use a clean, disposable working directory and avoid running the build as root. After makepkg completes, query the resulting archive before installation:
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pacman -Qip ./built-package.pkg.tar.zst
pacman -Qlp ./built-package.pkg.tar.zstCompare the package name, version, architecture, dependencies and file list with what you expected from the PKGBUILD. Install only after that review:
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sudo pacman -U ./built-package.pkg.tar.zstBuilding as an ordinary user limits the damage a malicious build command can do to the system, although it does not make arbitrary build scripts safe. Keep the build directory disposable because source trees can contain generated files, failed patches and downloaded artifacts that should not be reused without review.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Fix “invalid or corrupted package (PGP signature)” safely
A signature failure is a diagnostic signal, not a prompt to disable verification. Work through these checks in order.
1. Check the system clock
OpenPGP validity depends on time. An incorrect local or UTC clock can make an otherwise valid key appear expired or not yet valid. Correct time synchronization, then retry the operation. This is especially important after installing on hardware with a dead clock battery or after switching between operating systems. Check both the displayed local time and the date; a clock that is off by a day can invalidate a newly issued signature.
2. Refresh the Arch keyring through a trusted path
Update archlinux-keyring using a trusted repository path, then perform a complete upgrade:
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sudo pacman -SyuIf the keyring package itself cannot be authenticated, do not force the install from an arbitrary download. Use a known-good network and mirror configuration or another trusted recovery method, then retry the normal upgrade. Treat an expired key and an unknown key differently: the former may require current keyring data, while the latter requires confirming that the repository and signer are the ones you intended.
3. Redownload a suspect package
A damaged cached archive can produce an invalid signature even when the repository copy is correct. Remove the suspect cached file, download it again from the configured mirror and retry. Repeating the same transaction against the same damaged file will not repair it. If a fresh download fails consistently, compare results from a known-good mirror rather than repeatedly trusting a single failing transfer.
4. Check mirror and repository configuration
Confirm that mirror URLs, repository names and sections in /etc/pacman.conf are the expected Arch configuration. A stale, incomplete or third-party repository can provide metadata that does not match the keys you trust. If only one mirror fails while others work, change to a known-good mirror and refresh package databases. Make sure the package is not being selected from an unintended repository with a different signing policy.
5. Do not bypass the check
Never use SigLevel = Never or --skippgpcheck as a normal repair. Both disable a security layer. At most, a controlled diagnostic experiment should have a clearly defined scope and an immediate rollback; do not install production software while signature enforcement is disabled. Restore the required policy before any ordinary transaction.
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Verify an Arch Linux installation ISO
Verify the ISO before writing it to a USB drive or booting it. Download all three files from Arch’s official release page:
- the ISO, such as
archlinux-<version>-x86_64.iso; - its detached signature,
archlinux-<version>-x86_64.iso.sig; - the release-key file published for that release.
Using the modern Sequoia OpenPGP command documented for Arch releases:
sq verify --signer-file release-key.pgp --signature-file archlinux-<version>-x86_64.iso.sig archlinux-<version>-x86_64.isoReplace <version> with the exact version in the downloaded filenames. A successful result confirms that the ISO matches the detached signature made by a key in the supplied release-key file. If verification fails, do not write the image to removable media; redownload the ISO, signature and key, and check that all filenames refer to the same release.
An equivalent GnuPG workflow is also valid when you have imported and authenticated the expected Arch release key. In either workflow, the key file and the signature must come from the official release publication, not from an unrelated mirror attachment. Verify before writing the image because a signature check performed after booting cannot undo a compromised installer.
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A practical decision checklist
- Identify the artifact. Decide whether it is a repository package, local archive, AUR recipe, VCS build or ISO.
- Identify the trust source. Use Arch’s packager keys, a documented upstream release key or an AUR maintainer’s declared fingerprint—not an arbitrary key supplied beside the file.
- Verify integrity before execution. Check the pacman signature, detached signature or source checksum before installing or building.
- Inspect executable content. For packages, review metadata and paths. For PKGBUILDs, read every function and install script.
- Keep verification enabled. Repair clock, keyring, cache and mirror problems instead of suppressing signature checks.
- Recheck after changes. If a source URL, commit, package archive or signer key changes, treat it as a new verification event.
What to record for repeatable verification
For packages you deploy more than once, keep a small record of the package version, repository or source URL, signer fingerprint, selected VCS revision and the date you checked it. This is especially useful for local archives and AUR recipes, where the same filename can later point to different content. Record why you trusted an upstream key and where you obtained its fingerprint. When a build changes, compare the new PKGBUILD, checksums, signatures and file list instead of assuming that a familiar name means an unchanged artifact.
For a team or multiple machines, use the same pacman signature policy and keyring maintenance procedure everywhere. A package accepted on one host because its local-file policy is permissive may be rejected on another host with stricter settings; that difference is a configuration signal, not proof that either archive is safe.
Frequently Asked Questions
How do I verify an Arch package before installing it?
For a repository package, keep signature enforcement enabled and install with pacman -S; continue only when pacman reports a valid signature from a trusted Arch key. For a local archive, check LocalFileSigLevel, verify any detached signature with the expected signer fingerprint, then inspect it with pacman -Qip and pacman -Qlp.
How can I check an AUR PKGBUILD for malware?
Read the entire PKGBUILD before running makepkg. Inspect every source URL, checksum array, executable function, install script and hook. Look for unexpected downloads, obfuscated commands, prebuilt binaries, writes outside $pkgdir, credential access and changes to unrelated user data. Use upstream signatures and validpgpkeys when available, and build as a normal user in a disposable directory.
Why does pacman report an invalid or corrupted package PGP signature?
Common causes are an incorrect system clock, an outdated archlinux-keyring, a damaged cached archive, or a stale or unintended mirror or repository. Correct the clock, update the keyring through a trusted path, perform a full pacman -Syu, redownload the package and check mirror configuration. Do not use SigLevel = Never or --skippgpcheck as a routine fix.
Does a successful pacman -U prove that a local package is safe?
No. Local-file policy may allow an unsigned archive, so successful installation alone does not establish provenance. Obtain the archive and detached signature from the expected publisher, verify the signer fingerprint, and inspect package metadata and the complete file list before installing.
Does makepkg use pacman’s keyring?
No. makepkg’s source-signature checks use the user’s PGP keyring, while pacman uses the keyring managed by pacman-key. Confirm upstream fingerprints before importing or trusting keys in the user keyring.
How do I verify an Arch Linux ISO?
Download the ISO, its matching .sig file and the official release-key file. Run sq verify --signer-file release-key.pgp --signature-file archlinux-<version>-x86_64.iso.sig archlinux-<version>-x86_64.iso and do not write or boot the image if verification fails.
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The Bottom Line
Use the trust mechanism that matches the artifact: pacman signatures for official repositories, detached signatures and metadata inspection for local archives, checksum and upstream-signature checks plus PKGBUILD review for AUR builds, and the official detached signature for ISOs. Keep the keyrings, clock and mirror configuration healthy, and repair failures instead of disabling verification.
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