Ubuntu, Kubuntu, and most derivatives use Debian packages to install and update most software. The official documentation provides a great overview of all the pieces.
Upgrade your packages once a day. This keeps your system up-to-date with the latest security and feature enhancements. Updates on the Focus rarely cause issues because it ships with only 18.04 and 20.04 Long Term Support (LTS) OSes designed to minimize breakage. On top of this the Focus team also run daily regression tests to identify and quickly fix any issues.
Even with all these safeguards though, we still recommend delaying updates until after critical work is done for the day. Although glitches are rare, it is best to deal with them on your own terms!
The Discover package manager is the official KDE GUI to update,
browse, install, and remove most software from the system. It is built on
top of the
apt package system. Please refer to the
documentation as needed.
The typical update procedure is illustrated below. Package updates are indicated by a blue dot in the system tray.
Click on the update indicator to review changes.
Update is clicked, Discover starts and the
update list is refreshed.
Click on the
Update All button to start the process.
User authorization is required.
The update takes seconds or minutes depending on the number of packages.
After updates are complete Discover will appear as shown.
Discover can find, install or remove software.
Muon is another GUI on top of the package system. It is more powerful than Discover, but also more complex. If you are a power user, Muon might be your preferred tool.
Muon provides a more complex but faster interface.
Muon can inspect installed software packages.
One can manage software using the apt package tools including
apt, apt-get, apt-cache, aptitude, and
Notice that the CLI tools use
update as the keyword to
update the list of software, while
upgrade is used to
install updated packages.
Discover has a bug where the proxy setting can get stuck. Here are the steps to resolve:
sudo apt install sqlitebrowser
sudo sqlitebrowser /var/lib/PackageKit/transactions.db
sudo systemctl restart packagekit.service
One can Rollback upgrades. Sorry, we wish it were easier.
We try hard to provide a useful workflow validated by professionals. However, we cannot anticipate every situation, and therefore cannot guarantee this procedure will work for your needs. Always back up your data and test the workflow to determine the correct procedure for you.
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