On 04/01/2010 03:01 PM, Johannes Rohr wrote:
> I have seen the same. What solved it for me was purging gdm and
> reinstalling it, this indicates that there is indeed something wrong
> with the conffiles ( dpkg --purge --force-depends gdm gdm-guest-session
> )

That worked - once. Note: I'd even mv'ed /etc/gdm out of the way to
/etc/x-gdm-x and then of course reinstalled gdm gdm-guest-session and
ubuntu-desktop.

Rebooted & I could login via gdm, but when I rebooted & tried to log in
again I got the loop again as soon as I tried to enter the password.
Mouse freezes, screen goes black, gdm starts again, select user, rinse,
repeat.

Had to go back to recovery mode again, resume, login via the console,
'startx'. Then create an /etc/gdm/custom.conf file again so that I can
at least autologin with the primary user:
[daemon]
AutomaticLogin=<username>
AlwaysLoginCurrentSession=false
AutomaticLoginEnable=true
TimedLoginEnable=false
TimedLogin=<username>
TimedLoginDelay=30
DefaultSession=gnome

Rebooted w/autologin 4 times just to be sure that is working. Also tried
with a different username/account in the 'custom.conf' and rebooted
several time & that works as well.

So I think as Steve & Martin point out, this is most likely a PAM isse.
@Steve/Martin: the machine is 100% under my control so I'm willing to
provide additional info and/or purge/modify any PAM/passwd's if that
will help.

-- 
pam_unix(gdm:auth): conversation failed
https://bugs.launchpad.net/bugs/516520
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