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From: martinko <gamato@users.sf.net>
Date: Sat, 07 Jul 2007 20:40:58 +0200
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Subject: cannot log in via console, cannot su(1), only as root
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hello list,

i was updating sw configuration of my old computer and towards the end i 
noticed i couldn't log in on local console other than root.  i tried 
remote ssh using public keys which worked but i found out su(1) to any 
user except root does not work either.  i've no idea how i could 
possibly manage to "break" my system like this and unfortunately i need 
to fix it by tomorrow.  therefore i would really appreciate your prompt 
hints as what to check etc.

many thanks in advance !!

martin