Not able to login from GUI

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# 1  
Old 02-01-2010
Not able to login from GUI

When I installed Ubuntu on my laptop, I had chosen "automatic login" . So i was not asked ofr username and password everytime I switched on. I later wanted to change the settings. So I went to systems-->administration-->login window-->security. There I disabled automatic login and I reboot the computer. Now the GUI does not allow me to enter USername and password. It says "Authorization denied" at the login screeen.. PLease help me.
# 2  
Old 02-01-2010
At login screen press alt+ctrl+f1 and login into console. There - log in and use "startx" command. I hope (wild guess) this works as I don't have a Ubuntu at hand at the moment. If it does - go to the options and review them.
# 3  
Old 02-02-2010

Another workaround:
if you installed grub as boot loader, you can edit the kernel parameters before booting via grub. Add a 'init=/bin/sh' parameter, and boot. That gives you a root shell. Remount the root filesystem, like 'mount -o remount,rw /'. create the user account you seem to be missing (useradd, see manpage). remount the file system readonly, like 'mount -o remount,rw /'. exit the shell, aka reboot. That should have created a valid user.

I do not know Ubuntu that well, but that should work generically on any linux which has grub. W/o grub, you can achieve the same if you have a boot CD somewhere.
# 4  
Old 02-02-2010
At Grub choose "recovery mode" as the choice and it should drop you into a prompt and you can reset your password there using "passwd username"

If that doesn't work try these links:
How to reset your password in Ubuntu
How-To Recover password under Ubuntu|Ubuntu Geek
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