How do I avoid dependency issues?

Use official repositories, be cautious with PPAs, do not mix releases, always run apt update before installing. When using third-party .deb files, use 'apt install ./file.deb' instead of dpkg -i to auto-resolve dependencies.

Can I force install ignoring dependencies?

Yes with dpkg --force-depends, but this is strongly discouraged. It creates broken packages that cause cascading failures. Fix the dependencies properly instead of forcing.

apt Unmet Dependencies — Broken Packages and Dependency Resolution Failures

Errorpackage

Overview

Fix apt 'unmet dependencies' and 'broken packages' errors on Debian and Ubuntu when package installations fail due to conflicting or missing dependencies.

Key Details

apt resolves package dependencies automatically but can fail when versions conflict
Broken packages occur when a partially installed package has unsatisfied dependencies
Mixing repositories (Ubuntu main with PPAs, different release versions) is the most common cause
dpkg --configure -a finishes configuring partially installed packages
apt --fix-broken install attempts to resolve broken dependencies automatically

Common Causes

Interrupted installation (power loss, Ctrl+C) leaving packages in a half-installed state
PPA repository providing packages that conflict with official Ubuntu repository versions
Manual dpkg -i of a .deb package without its dependencies being available
Mixing package sources from different Ubuntu releases (e.g., Jammy packages on Focal)

Steps

1Try automatic fix: 'sudo apt --fix-broken install' to resolve dependency issues
2Configure pending packages: 'sudo dpkg --configure -a' to finish interrupted installations
3Force fix with specific version: 'sudo apt install package=version' to install a compatible version
4Remove the conflicting package: 'sudo apt remove conflicting-package' then retry installation
5Last resort: 'sudo apt clean && sudo apt update && sudo apt --fix-broken install'

Related Items

linux-gpg-key-expired-cannot-verify

More in Package

linux-apt-unmet-dependenciesLinux APT Unmet Dependencies

Error

linux-dpkg-error-processingLinux dpkg Error Processing Package

Error

linux-npm-eacces-permission-error-globalnpm EACCES Permission Error — Global Package Install Permission Denied

Warning

Frequently Asked Questions

Generally yes. It attempts to install missing dependencies or remove the broken package. It shows what it plans to do before executing. Review the proposed changes before confirming, especially if it wants to remove packages.