Packages

How to Use the apt Command in Linux

Use apt to find, install, update, and remove packages on Debian or Ubuntu. Compare upgrade modes, preview removals, verify results, and diagnose errors.

How to Install DEB Packages in Ubuntu

Install a downloaded DEB in Ubuntu with APT or a GUI. Check architecture and dependencies, interpret installation errors, and verify updates and package status.

How to Manage APT Repositories on Ubuntu

Find Ubuntu's APT source files, choose a supported PPA or vendor archive, configure signing keys, inspect package candidates, and troubleshoot errors.

How to Check the Ubuntu or Debian Version

Check your Ubuntu or Debian release with /etc/os-release, interpret version and codename fields, and resolve point-release or Testing/Sid mismatches.