I had the same original problem of the looping login / segfaults and then samba problems (post 14 here). I had followed all the suggestions here and ran into the same issue that Luca A has.
After some help from jrib and marcelkoopman on #ubuntu (irc.freenode.net) I got everything working again.
Essentially all I did was revert common-auth and common-password to their original states - ie including the problematic lines, completely remove samba and samba-common (including all the dependancies of samba-common) using synaptic, reboot my machine, reinstall the two packages and hey presto its all working again :)
Many thanks to jrib and marcelkoopman for their help.
Luca A (and all).
I had the same original problem of the looping login / segfaults and then samba problems (post 14 here). I had followed all the suggestions here and ran into the same issue that Luca A has.
After some help from jrib and marcelkoopman on #ubuntu (irc.freenode.net) I got everything working again.
Essentially all I did was revert common-auth and common-password to their original states - ie including the problematic lines, completely remove samba and samba-common (including all the dependancies of samba-common) using synaptic, reboot my machine, reinstall the two packages and hey presto its all working again :)
Many thanks to jrib and marcelkoopman for their help.
Ohkie