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The error usually means another program is using Ubuntu’s APT or dpkg package database. Close other package managers, identify the process holding the lock, let legitimate work finish, and only terminate a process that is demonstrably frozen. Do not start by deleting lock files.
Quick, safe recovery
- Stop entering additional APT commands and close App Center, Software Updater, Synaptic, and terminals running
apt,apt-get,aptitude, ordpkg. - Wait several minutes if Ubuntu has just booted or recently came back online; automatic updates may be running.
- Check the lock owner:
sudo fuser -v /var/lib/dpkg/lock /var/lib/dpkg/lock-frontend - If the process is active, allow it to finish. If it is confirmed frozen, terminate it gracefully as described below.
- Repair any incomplete configuration and verify APT:
sudo dpkg --configure --pending sudo apt update
This conditional sequence follows the Debian dpkg team’s guidance: wait or quit the frontend, inspect the holder, and repair dpkg afterward.
What the lock error means
APT and dpkg use process-bound locks so two operations cannot modify package data simultaneously. The filename can remain on disk after a process exits; its presence alone does not prove that it is currently locked.
| Path | Generally protects |
|---|---|
/var/lib/dpkg/lock-frontend |
Frontend-level package operations |
/var/lib/dpkg/lock |
dpkg’s package database |
/var/lib/apt/lists/lock |
Downloaded repository index lists |
/var/cache/apt/archives/lock |
Cached package archives |
open (11: Resource temporarily unavailable) normally means another process holds the lock. open (13: Permission denied) is different and usually means the command lacks sufficient privileges, such as when sudo was omitted. See the distinction in this Ask Ubuntu explanation.
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Why Ubuntu reports a held lock
- Another
apt,apt-get,dpkg, oraptitudecommand is running. - App Center, Software Updater, Synaptic, or another graphical frontend is installing packages.
- An automatic update started after boot or on its scheduled timer.
- A previous upgrade was interrupted.
- Cloud-init, provisioning, configuration management, a VM startup task, or a container build is using APT.
- Two terminal commands were launched at the same time.
- A package process is genuinely stuck.
Find the process holding the lock
Inspect the common lock files
sudo fuser -v /var/lib/dpkg/lock /var/lib/dpkg/lock-frontend
sudo fuser -v /var/lib/apt/lists/lock /var/cache/apt/archives/lockAn alternative for one path is:
sudo lsof /var/lib/dpkg/lock-frontendList package-related processes
ps -ef | grep -E '[a]pt|[d]pkg|[u]nattended'
pgrep -a -f 'apt|dpkg|unattended'apt,apt-get, or a graphical frontend is normally safe to wait for.unattended-upgrademay be a normal security update.dpkgmay be unpacking packages or running maintainer scripts; do not kill it casually.- “Frozen” depends on the operation, package size, disk speed, network, and maintainer scripts. A long-running process is not automatically stuck.
Check automatic updates
On systemd-based Ubuntu installations, inspect services and timers:
systemctl status apt-daily.service
systemctl status apt-daily-upgrade.service
systemctl status unattended-upgrades.service
systemctl list-timers --all | grep -E 'apt|unattended'Ubuntu documents automatic-update settings in /etc/apt/apt.conf.d/20auto-upgrades; APT’s periodic behavior is described in its apt.conf manual and the Ubuntu automatic-updates guide.
If unattended-upgrades is active, normally let it finish. If an administrator has confirmed it is stuck and must regain control, stop that service before repair:
sudo systemctl stop unattended-upgradesDo not routinely remove automatic updates: they provide security maintenance. Adjust APT periodic settings when scheduling is the problem instead of deleting locks or purging the package.
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When to wait, and when to stop a process
Wait for active work
Waiting is the safest option when output, disk activity, logs, or package progress indicate legitimate work. Closing a GUI frontend is low risk; abruptly ending dpkg during unpacking or configuration is not.
Terminate only a confirmed frozen process
Record the PID and command first. Debian’s recommended interactive sequence sends TERM before considering a forceful signal:
sudo fuser -vki -TERM /var/lib/dpkg/lock /var/lib/dpkg/lock-frontendIf the process does not respond and intervention is unavoidable:
sudo fuser -vki -KILL /var/lib/dpkg/lock /var/lib/dpkg/lock-frontendKILL is a last resort. Never kill a process merely because a lock filename exists. On a server or VM, take a snapshot or backup where practical and check that no deployment or security update is in progress.
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Repair an interrupted package operation
Complete pending configuration
sudo dpkg --configure --pendingThis configures packages that were unpacked but not fully configured. If the exact error says “dpkg was interrupted, you must manually run ‘sudo dpkg –configure -a’,” use:
sudo dpkg --configure -aRepair dependencies and refresh metadata
sudo apt-get -f install
sudo apt updateapt-get -f install asks APT to correct dependency problems; apt update refreshes repository metadata and does not itself upgrade installed packages. If configuration names a particular package or maintainer script, troubleshoot that package—the lock is no longer the main issue.
Would rebooting help?
A normal reboot can clear a transient process conflict after applications are closed and no package operation is making progress. It does not repair incomplete configuration, so run sudo dpkg --configure --pending afterward when required. Never forcibly power off while Ubuntu reports that packages are being installed or while dpkg is actively writing.
Do not delete lock files
Never use lock-file removal as the first fix. Commands often suggested online include:
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sudo rm /var/lib/dpkg/lock*
sudo rm /var/lib/apt/lists/lock
sudo rm /var/cache/apt/archives/lockdpkg locking belongs to the active process, not simply to the filename. Removing a file can let another operation proceed while the original process still modifies package data, causing an incomplete installation, corrupted package database, or filesystem damage. The Debian dpkg team explicitly says that removing dpkg lock files is not the correct solution: dpkg FAQ.
Distinguish related errors
Permission denied
E: Could not open lock file ... - open (13: Permission denied)Retry with appropriate privileges, for example sudo apt update. If sudo fails, investigate the account, sudo configuration, or a restricted container.
“dpkg was interrupted”
Run sudo dpkg --configure -a, then retry APT.
Broken dependencies
Run sudo apt-get -f install. This is dependency repair, not proof that a lock is currently held.
Repository, DNS, or signature failures
Mirror, network, release-file, and signature errors require repository or network troubleshooting, not lock removal.
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Read-only filesystem
Investigate mount status and disk/filesystem health before attempting package repairs.
Special environments
WSL
Check every shell in the same distribution, startup scripts, and Linux processes. A Windows process does not normally own the Linux APT lock.
Docker and containers
Parallel package operations inside a container can collide. Order package installation in one build step or process and fix the Dockerfile rather than adding repeated kill commands.
Cloud images and provisioning
Cloud-init, first-boot scripts, and configuration-management tools may be installing packages. Check their status and logs and wait for provisioning to finish.
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Before stopping anything, confirm that no deployment, security update, or configuration-management run is active. Use a maintenance window or console access if the host is unresponsive.
Inspect logs when the error keeps returning
sudo journalctl -u apt-daily.service
sudo journalctl -u apt-daily-upgrade.service
sudo journalctl -u unattended-upgrades.service
sudo tail -n 100 /var/log/dpkg.log
sudo tail -n 100 /var/log/apt/history.log
sudo tail -n 100 /var/log/apt/term.log/var/log/dpkg.log records dpkg activity, while /var/lib/dpkg/status is the package status database. Repeated contention usually points to a scheduled update, boot-time automation, a provisioning script, or a second interactive package manager; identify that cause instead of deleting locks.
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