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Full Discussion: Not able to login from GUI
Top Forums UNIX for Advanced & Expert Users Not able to login from GUI Post 302391630 by Andre_Merzky on Tuesday 2nd of February 2010 04:23:04 AM
Old 02-02-2010
Java

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.
 

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GRUB-INSTALL(8) 							FSF							   GRUB-INSTALL(8)

NAME
grub-install - install GRUB on your drive SYNOPSIS
grub-install [OPTION] install_device DESCRIPTION
Install GRUB on your drive. -h, --help print this message and exit -v, --version print the version information and exit --root-directory=DIR install GRUB images under the directory DIR instead of the root directory --grub-shell=FILE use FILE as the grub shell --no-floppy do not probe any floppy drive --force-lba force GRUB to use LBA mode even for a buggy BIOS --recheck probe a device map even if it already exists INSTALL_DEVICE can be a GRUB device name or a system device filename. grub-install copies GRUB images into the DIR/boot directory specfied by --root-directory, and uses the grub shell to install grub into the boot sector. REPORTING BUGS
Report bugs to <bug-grub@gnu.org>. SEE ALSO
grub(8), update-grub(8). The full documentation for grub-install is maintained as a Texinfo manual in the grub-legacy-doc package. If the info and grub-install programs are properly installed at your site, the command info grub-install should give you access to the complete manual. grub-install (GNU GRUB 0.97) January 2013 GRUB-INSTALL(8)
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