For what is worth, I saw the following warnings when guix system reconfigure was running:
https://multimedialib.files.wordpress.com/2020/01/guix-system-reconfigure-2020-01-25.png
- bug#39281: gdm doesn't start Jack Hill
- bug#39281: gdm doesn't start sirgazil via Bug reports for GNU Guix
- bug#39281: gdm doesn't star... Jack Hill
- bug#39281: gdm doesn't start Jack Hill
- bug#39281: gdm doesn't star... Raghav Gururajan
- bug#39281: gdm doesn't ... Leo Prikler
- bug#39281: gdm does... Leo Prikler
- bug#39281: gdm... Jack Hill
- bug#39281:... sirgazil via Bug reports for GNU Guix
- bug#39281: gdm... Danny Milosavljevic
