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Linux APT 'Unmet Dependencies — Broken Packages' Error

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Overview

APT 'unmet dependencies' or 'broken packages' error means package dependency requirements cannot be satisfied, blocking installation.

Key Details

  • Dependency resolution failure prevents package installation
  • Can cascade — one broken package can block many others
  • Mixing repositories (PPAs) is the most common cause
  • apt-get -f install attempts to fix broken dependencies automatically
  • In severe cases, dpkg --force may be needed (use cautiously)

Common Causes

  • Third-party PPA providing packages incompatible with system versions
  • Partial upgrade leaving packages in inconsistent state
  • Manually installing .deb files that conflict with repository versions
  • Repository metadata out of date
  • Forced package removal breaking dependency chains

Steps

  1. 1Try automatic fix: sudo apt --fix-broken install
  2. 2Update package lists: sudo apt update
  3. 3Remove problematic PPA: sudo add-apt-repository --remove ppa:name/ppa
  4. 4Force reconfigure: sudo dpkg --configure -a
  5. 5As last resort, identify and remove the conflicting package: sudo dpkg -r --force-depends package-name then sudo apt --fix-broken install

Tags

linuxaptbroken-packagesdependenciesubuntu

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Frequently Asked Questions

A package requires specific versions of other packages that are not available or conflict with what is installed.