The virtual machine installed an Ubuntu, forgot the password? Get root user?

1, you can select a second repair in the Grub interface, but no grub can refer to: 1 restart Ubuntu, then the long press SHIRFT into the Grub menu, 2 Select recovery mode, press "E" key to enter the edit page; 3 Replace the RO single with RW Singleinit=/bin/bash (ubuntu10.10 not to change) 4) press ctrl+x into Single-user mode, the current user is root; (normal user login also line) 5) to/etc directory to modify sudoers permissions: chmod 0440 sudoers, fix; You can also add the root password, the next time not so troublesome; 6 press Ctrl+alt+del restart; 2, Ubuntu root password is not empty Ah, nor you can set it, but the system randomly generated, You set up the password for your own account when you install it. 1 terminal input Su root, prompt you root password, of course you do not. Don't forget the power of sudo, using the second method. 2 The terminal input sudo su root, which means that the system I want to get root permission with temporary root privileges, of course, the system will not reject you. Just type in your password. 3 simpler commands in fact, but not a bit of meaning, input su-i