Unable to login after upgrade

[Colin Law]

On Sat, 31 Oct 2020 at 15:49, Chris Green <cl at isbd.net> wrote:
>
> On Sat, Oct 31, 2020 at 03:26:49PM +0000, Colin Law wrote:
> > On Sat, 31 Oct 2020 at 15:16, Volker Wysk <post at volker-wysk.de> wrote:
> > >
> > > Am Samstag, den 31.10.2020, 14:20 +0000 schrieb Gregory Gamble:
> > > > I had looked at Volker's suggestion of looking at the log file for gdm3
> > > > prior to this, but like Volker /var/log/gdm3 for me is empty.
> > >
> > > As someone else has pointed out: ~/.xsession-errors could be the right
> > > place.
> >
> > I don't think ~/.xsession-errors is used any more, though I could be wrong.
> >
> Well I'm on 20.04 and .xsession-errors has today's date.

In that case my statement "I could be wrong" would appear to be an
understatement.
What is in it?
On my system it is dated June 2018, on two other 20.04 systems here it
doesn't exist.  That would suggest that it isn't used unless there is
an error.

Colin