How to Boot as Root in Ubuntu
Just add an "single" option (without quote) in last of the grub configuration after you press E button in keyboard when Grub displays boot option menu.
Example:
kernel /vmlinuz root=/dev/sda1 ro single
How to Reinstall Grub in MBR
1. Boot into your sistem use Grub enabled livecd (ex: RIP). Press C to enter Grub Terminal
Enter this command (please change to your real root partition)
root (hd0,0)
kernel /vmlinuz root=/dev/sda1 ro single
initrd /initrd.img
boot
2. Use commands below to re-install grub to MBR
grub-install hd0
If no error reported, so you'll succes re-install grub into MBR.
How to Boot Another Linux Instalation
In case you can,t boot it directly from the media, but it has same kernel version, you can boot it imediately use the installed kernel and initrd on your system.
For example, you want to boot your usb installed system.
Same as tips number 1, you just change the root path only.
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