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Before checking, confirm your release and APT sources
APT can report only updates offered by the repositories configured on your machine. Before changing sources—especially on an older system, after a release upgrade, or when third-party repositories are in use—check which Debian release is installed and inspect the configured APT sources.
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Security packages for Debian Stable come through its security archive. Suite naming has changed over time: beginning with Bullseye, the security suite uses the codename-security form. Do not copy a codename or repository line from an older example without checking that it matches your installed release. Debian’s Handbook guidance on APT explains the archive setup and update process.
Refresh package lists and list available upgrades
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Refresh the indexes from configured repositories:
sudo apt updateLook for failed repositories, signature errors, or unreachable sources. If refreshing a source fails, its local index may be stale and cannot show the newest packages from that source.
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List installed packages for which a newer version is available:
apt list --upgradableThis output is not a security-only list. It can include security fixes, bug fixes, and other updates. Debian’s package-management FAQ documents this command for listing packages with newer versions available.
Tell security fixes apart from other upgrades
APT builds its upgrade list from the package indexes and sources configured on your system; it does not label every line as a security fix. For security-specific context, consult Debian Security Information and the relevant advisory or security tracking entry. Whether an update appears also depends on the host’s sources and whether their indexes refreshed successfully.
Install routine updates with apt upgrade
For a routine, lower-disruption upgrade, run:
sudo apt upgrade
Read APT’s transaction summary before accepting it. Debian documents apt upgrade as upgrading packages without removing installed packages or adding new packages. If a package’s dependency changes cannot be handled within those limits, it may be held back.
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Use the summary to understand what APT proposes to change. If the transaction is unexpected or unsuitable for the machine, stop and investigate rather than confirming automatically.
When to consider apt full-upgrade
If packages are held back, examine why and inspect the proposed transaction before choosing a broader upgrade. sudo apt full-upgrade can install new dependencies or remove packages to resolve dependency changes; it is not the default routine-update command.
Review every proposed addition and removal. Proceed only if the changes are acceptable for the machine’s services and maintenance window. Debian’s FAQ and Handbook describe the distinction between the two upgrade commands.
| Command | Purpose | What to review |
|---|---|---|
apt upgrade |
Routine upgrade of installed packages. | Avoids removals and new package installations; some upgrades may be held back. Review APT’s summary. |
apt full-upgrade |
Broader dependency resolution when package changes require it. | May add or remove packages. Inspect every proposed addition and removal before confirming. |
Verify the result and keep a useful record
After installation, check the command output for errors or packages that could not be upgraded. APT and dpkg record package-management activity in logs including /var/log/apt/history.log, /var/log/apt/term.log, and /var/log/dpkg.log, as documented in the Debian Handbook.
On production or otherwise availability-sensitive systems, follow the local backup, maintenance-window, change-control, and service-restart procedures. Installing a package does not by itself establish whether a particular service needs a restart.
Optional: automate updates with unattended-upgrades
Debian offers unattended-upgrades as an option for automatically installing updates from configured APT sources. Debian describes its usual focus as security updates, while its scope can be customized. The package’s presence alone does not establish that automation is enabled or configured as intended.
Check that it is installed, enabled, and configured for the sources and update scope you intend. Its behavior and logs are documented in the Debian trixie unattended-upgrade manual page; the Debian Handbook also discusses keeping a system up to date. Automated updates still depend on correct sources and successful index refreshes.
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