Virtualbox boot Ubuntu 12.04 into recovery mode

Put the Ubuntu ISO in the drive
When the VM starts up, press the ESC key to get into the install options screen
Press f6 to get the boot argument line to show (then ESC to hide the submenu)
Go down to boot from first hard disk, then type “boot=/casper single”
This should open up another menu, with the option to boot into recovery
And then you get another menu, choose to boot as root user
When you’re in the shell as root user, type: mount -o remount,rw /
Should now have read-write access to filesystem as root user

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