Unable to login after upgrade

[Colin Law]

On Fri, 30 Oct 2020 at 18:33, Gregory Gamble <greg.gamble at uwa.edu.au> wrote:
> ...
> ... if I put in the right password, it just cycles back,
>     to the password prompt.

To the password prompt or the user selection screen?

> ...
> I don't really get what is so different about desktop login vs a remote login.
> If there's a problem, it's usually the other way round, because the
> network is too strict.

I imagine what is happening is that you are logging in but then X (or
something) is crashing and logging you out again. It could be a
graphics drive issue I think.

Log in remotely and watch syslog
tail -f /var/log/syslog

Then try and login locally and see what appears in syslog.

>
> I may try a 20.10 upgrade
> ...is it easy to reverse to 20.04.02 if one does that?

No, not as far as I know.  In fact I suspect it is not possible.

Colin