Somehow your /dev/console got hurt. You can mount by hand (e.g. on /target) your root filesystem from a Hurd installation CD and run

settrans -c /target/dev/console /hurd/term /dev/console device console

to restore it.

You can also set it from a Linux system with:

touch /target/dev/console
setfattr -n gnu.translator -v "/hurd/term\0/dev/console\0device\0console\0" /target/dev/console