I'm running Ubuntu 8.10 and whenever I try to login, I get an error message stating that I have been logged out in less than 10 seconds.
I can successfully login using GNOME Failsafe...

Here is an output of .xsession-errors

/etc/gdm/Xsession: Beginning session setup...
Setting IM through im-switch for locale=en_US.
Start IM through /etc/X11/xinit/xinput.d/all_ALL linked to /etc/alternatives/xinput-all_ALL.
/etc/X11/xinit/xinput.d/all_ALL: 1: Syntax error: word unexpected (expecting ")")

I can't figure out what is causing this problem or how to fix it.

I think the problem may have came from an fsck.

Yessterday (around the time this problem showed up), while booting it did an fsck (mounted 25 times with no check) and it had some errors.
It booted me into a recovery shell to correct some errors.
There were several problems with various things, so I'm wondering if I answered something incorrectly.
I honestly just answered 'y' to everything because I didn't have time to waste and really needed to get my computer booted so I could get to work.

In my case /etc/alternatives/xinput-all_ALL is an exectuable, which I'm not sure if thats correct.

edited and removed stupid answer :-)