I just booted my Knoppix system and it tells me:
<boot text>
INIT: version 2.78-knoppix booting
warning: can't open /etc/fstab: Invalid argument
warning: can't open /etc/mtab: Invalid argument
mount: can't find /proc in /etc/fstab or /etc/mtab
Loading /usr/share/keymaps/i386/qwerty/us.kmap.gz
after which it hangs

fsck told me that it removed 3 nodes or something, must be the problem... Can anybody give me hint what to do now?

I'll boot my Knoppix CD, in an hour or so, I'll take my dinner first.