Condition
During rollback, the system displays messages similar to the following example:
Mounting /tmp
Mounting /home
. . .
. . .
[FAILED] Failed to mount /home.
See 'systemctl status home.mount' for details
. . .
. . .
Welcome to emergency mode! After logging in, type "journalctl -xb" to view
system logs, "systemctl reboot" ro reboot, "systemctl default" or ^D to
try again to boot into default mode.
Give root password for maintenance
(or type Control-D to continue):