1bashThis demonstrates upgrading all installed packages to their latest versions using apt.apt upgradeexternal toolsaptpackage managementupgrade packages
2bashUpdate the package list from the repositories without installing or upgrading any packages.apt updateexternal toolsaptpackage managementpackage list update
3bashThis demonstrates searching for the wget package in the APT package manager.apt search wgetexternal toolsaptpackage managementpackage search
4bashThis demonstrates installing the xournalpp PDF editor with pen signature functionality using sudo apt install.sudo apt install xournalppexternal toolsaptpackage managementinstall