Use single user mode to assist in troubleshooting system boot issues or for password recovery. To enter single user mode, follow the steps below.
Boot the switch, as soon as you see the GRUB menu.
Use the ^ and v arrow keys to select Advanced options for Cumulus Linux GNU/Linux. A menu similar to the following should appear:
- Select Cumulus Linux GNU/Linux, with Linux 4.1.0-cl-1-amd64 (recovery mode).
- Press ctrl-x to reboot.
After the system reboots, set a new root password.
btrfs, then reboot the system: