Hello Wawrzek! Thanks for replying! Happy New Year to you!

I'm not an installation expert, but CRUX media is on the USB stick, not your hard drive.

Right!

Are you sure your USB image is OK?

I didn't check the .ISO file against the MD5 checksum, but I guess it's OK because it boots fine once 'burned' into the USB stick. For anyone interested, in the meantime, I borrowed & plugged a PS/2 keyboard to be able to go to the next installation step. Unfortunately, all the mount commands I tried to tell the CRUX installation to check the /dev/sdc1 filesystem for the CRUX media failed (mount /dev/sdc1 /.tmpfs/.media). Re:

I have an error message saying that the CRUX media is not properly mounted.

Maybe my hardware is not supported by CRUX. I don't know the exact model of each devices so I tried the installation anyway. But I'm asking myself, if the boot phase of the CRUX 3.1 installation works, a simple fat32 mount command on the same device should work. Dominique.