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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GRUB(8) FSF GRUB(8)
NAME
grub - the grub shell
SYNOPSIS
grub [OPTION]...
DESCRIPTION
Enter the GRand Unified Bootloader command shell.
--batch
turn on batch mode for non-interactive use
--boot-drive=DRIVE
specify stage2 boot_drive [default=0x0]
--config-file=FILE
specify stage2 config_file [default=/boot/grub/menu.lst]
--device-map=FILE
use the device map file FILE
--help display this message and exit
--hold wait until a debugger will attach
--install-partition=PAR
specify stage2 install_partition [default=0x20000]
--no-config-file
do not use the config file
--no-curses
do not use curses
--no-floppy
do not probe any floppy drive
--no-pager
do not use internal pager
--preset-menu
use the preset menu
--probe-second-floppy
probe the second floppy drive
--read-only
do not write anything to devices
--verbose
print verbose messages
--version
print version information and exit
REPORTING BUGS
Report bugs to <bug-grub@gnu.org>.
SEE ALSO
update-grub(8), grub-install(8).
The full documentation for grub is maintained as a Texinfo manual in the grub-legacy-doc package. If the info and grub programs are prop-
erly installed at your site, the command
info grub
should give you access to the complete manual.
grub (GNU GRUB 0.97) January 2013 GRUB(8)