Updated sid, now unable to login

[Thomas Deselaers <thomas@Deselaers.de>]

Hello everybody,

I somewhat locked my computer for myself. I updated woody (as root) and
after this I logged out as root. Now I am not able to relogin anything to
this computer. What happened? How can I fix it?

When I try to login as root on a console, in /var/log/auth.log appears:

Jun 26 15:31:54 thomasds login[7420]: FAILED LOGIN (3) on `tty1' FOR `root',
Module is unknown

When I try to su there appears:

Jun 26 15:32:55 thomasds su[7475]: PAM unable to
dlopen(/lib/security/pam_unix.so)
Jun 26 15:32:55 thomasds su[7475]: PAM [dlerror: /lib/security/pam_unix.so:
undefined symbol: sgaddset]
Jun 26 15:32:55 thomasds su[7475]: PAM adding faulty module:
/lib/security/pam_unix.so
Jun 26 15:32:55 thomasds su[7475]: pam_authenticate: Module is unknown 
Jun 26 15:32:55 thomasds su[7475]: - pts/2 thomasd-root 


Anyone any ideas... I will stay logged in so far...

tia
thomasd