Yes, Rene, that worked. I deleted "/var/lib/gdm" and also ".local/share" and ".cache", which were 4.7 GiB and 2.9 GiB respectively.
Reading bug #36924 now I remember I've been through this before.
bug#40652: GDM does not starts after April 10 system reconfigure
sirgazil via Bug reports for GNU Guix Thu, 16 Apr 2020 07:08:03 -0700
- bug#40652: GDM does not starts after... sirgazil via Bug reports for GNU Guix
- bug#40652: GDM does not starts after... Rene via Bug reports for GNU Guix
- bug#40652: #36924 way solves the pro... R Veera Kumar
- bug#40652: #36924 way solves th... Guillaume Le Vaillant
- bug#40652: #36924 way solve... Ludovic Courtès
- bug#40652: #36924 way s... Guillaume Le Vaillant
- bug#40652: #36924 w... Guillaume Le Vaillant
- bug#40652: #36... Ludovic Courtès
- bug#40652:... Guillaume Le Vaillant
- bug#40652:... Ludovic Courtès
- bug#40652: GDM does not starts after... sirgazil via Bug reports for GNU Guix
