Full update of the desktop version of the Linux distribution Kubuntu
We update the package versions on the current system to the latest:
We launch the graphical utility to switch to another version of the distribution kit:
sudo apt-get update && sudo apt-get dist-upgrade
pkexec do-release-upgrade -m desktop -f DistUpgradeViewKDE
My transition on Kubuntu distribution from 21.04 to 21.10 took about half an hour and was successful.