Installer restarts after choosing to partition the disk

[Simen Endsjø]

Hi, I've been running Guix in a VM on my laptop, and wanted to 
install it
directly on my desktop. Using the guided installer, I get to the 
point where I
choose to partition the disk, and choose the recommended setup. 
Within a few
seconds, I'm sent to the start of the installer again. If I follow 
through, I
get to the choose disk window, but my disk isn't listed anymore.

Rebooting puts me into the same state as before.

Any idea what's going on? And how I can get some more information 
about what's
failing?