Configure Linux Mint 21

Login with "guru", password "guru" at the "MDM Login Manager" (MDM = Mint Display Manager).

You're greeted with a "Welcome screen". Take a look around and then remove the check "Show this dialog at startup".

Go to "Menu -> Administration -> Update Manager".

Read the text and click "OK".

Let's use a local mirror for fast downloads. Click "Yes" in the blue bar.

Authenticate with the "guru" password.

Click in the field "Main (...)". Another window appears. Select the repository with the fastest speed. In this case, let's choose LiteServer and click "Apply".

After changing the "repository mirror", the APT cache has to be updated. Click "OK".

Close the "Software sources" window and proceed with the updates. In this case, a new version of the "Update Manager" is available. Apply the update. Again, the password of "guru" is asked.

A list of available updates is presented. Select "Install Updates".

Confirm the (possible) message concerning additional changes. Again, the password of "guru" is asked.

Finally, all updates get downloaded and installed. Grab another coffee!

When the system is up-to-date, reboot the PC.

Login. Start the "Update manager" again and click "Refresh". Your system should be up-to-date. If not, repeat previous steps.

Go to "Menu -> Administration -> System Reports".

Ignore the reports concerning the "language packs" and "the system restore utility".

No problems detected? Done!