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The server is hosted by vpslink and running inside a xen-environment. During the upgrade somehow, besides other things, /dev/urandom got messed up, so I can't login via ssh because opensshd can't start. I have access to the boot-console-window, but get no login-prompt. The console log at the end says every 5 minutes one line of those:

INIT: Id "1" respawning too fast: disabled for 5 minutes
INIT: Id "1" respawning too fast: disabled for 5 minutes

It sometimes echoes my input, and by pressing ^O, i can access the Linux SysRq-functions. Via the console my provider gives me I can reboot the system, connect to console, but not supply any boot-parameters (As far as I know). So how can I e.g. get the system into single-user-mode or something like that? Or should I just call myself a goof, forget about my server and start over by loosing everything and reinstall from scratch?

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Your best bet would be a recovery disk. Your fastest bet would be a reinstall and restore from backups. –  voretaq7 Nov 10 '12 at 20:32
    
Hmm. I have a uneasy smile on my face. –  pbhd Nov 10 '12 at 20:55
    
I hope that's the smile of "I have backups but haven't done a restore test in a while" versus the smile of "I kinda just did the upgrade with no backups because I'm macho and like working without a safety net" (though if it's the latter any LiveCD will probably get you to the point where you can mount your filesystem and back up anything important before reinstalling -- this sounds like hosed libraries/dependencies rather than a wrecked filesystem, and the reinstall route is usually the quickest way to fix it unless you know what broke). –  voretaq7 Nov 10 '12 at 20:58
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