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.
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LEARN ABOUT DEBIAN
grub-install
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)