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Apt guides
Hands-on guides that cover Apt. Every command is run and verified on a live server before it is published.
Guideapt Basics: update and upgrade
Learn apt update and upgrade, the two commands you run before anything else on an Ubuntu server, and what each one does on a live machine.
GuideSearching and Inspecting Packages
Use apt search and show to find a package and read its version, size and dependencies before you install it on an Ubuntu server.
GuideRepositories and GPG Keys
Learn how an apt repository is defined, how a GPG key proves a package is genuine, and read the deb822 sources file Ubuntu 24.04 ships with.
GuideHolding and Pinning Versions
Pin a package with apt-mark hold and stop a routine upgrade moving it, then confirm the hold on a live Ubuntu server.
GuidePPAs and Third-Party Repositories
Add a PPA with add-apt-repository, and understand the trust you extend to that source, on a live Ubuntu server.