Booting GUIX in single user

[Alexander Asteroth]

Hi there,

While experimenting with Guix and installing one more package the disk of the 
test system filled to 100%. After shutting down the system to provide more disk 
to the VM, after reboot, the gdm session is indefinitely started and killed.

I tried to boot into non-x11 (level3) or single user mode but unfortunately the 
option I pass to Grub seems not to be recognized by the linux-libre kernel. Any 
hint where I find the correct boot options for a Guix System, so I can repair 
my system?

Thanks,
Alex

PS: one more thing. Is there any documentation about the packages? How to use 
them after just Guix install? After installing a package, e.g. a window manager 
like exam or a desktop environment like lxde additional steps are necessary for 
a user to use them. Can I find these steps somewhere? In particular to do the 
configuration such that it is compatible with the package and will not brake 
after updating the package to a new version.