bug#35308: GDM refuses to log into Gnome on Debian 9 or 10

[Rafa Gálvez]

Hi,

 I ran today into this problem using Ubuntu 22.04.2 LTS, and Josselin
 Poiret's fix worked perfectly:
 `export GI_TYPELIB_PATH=/usr/lib/girepository-1.0/`

 I installed Guix already some time ago, and the guix-install.sh script
 I used was very different from the one currently in master. So before
 applying this fix, I ran these functions from the script:
 sys_create_init_profile
 sys_create_shell_completion
 sys_customize_bashrc

 Then I added the export GI_TYPELIB_PATH to /etc/profile.d/zzz-guix.sh,
 restarted the laptop, and problem solved.

 Best,

Rafa