On Thu, Dec 09, 2021 at 01:12:15PM -0600, David Wright wrote: > Actually, the paragraph I referred to in ยง4.1.5, but did not quote, > is missing from buster (but was in stretch): > > "4.1.5 Prepare a safe environment for the upgrade > > "The distribution upgrade should be done either locally from a > textmode virtual console (or a directly connected serial terminal), > or remotely via an ssh link." > > I don't use a DM of DE, so I just don't start X. I don't know the > correct way for DEs etc.
Log out of the desktop environment. Then press Ctrl-Alt-F2 (or something similar) to get to a virtual console, and do the upgrade there. Stopping the Display Manager shouldn't be necessary. The reboot will take care of restarting it anyway.