I booted into stage 1 and it failed to continue, offering me to press
f for an interactive boot shell with pid 1.
An error occurred in stage 1 of the boot process, which must
mount the root filesystem on '/mnt-root' and start the stage 2.
Press one of the following keys:
i) to launch an interactive shell
f) to start an interactive shell having pid 1
(needed if you want to start stage 2's init manually)
r) to reboot immediately
*) to ignore the error and continue
f, prepared the system for boot by loading the drives I need. Now I need to boot into stage 2.
How can I run init stage 2 manually from this shell?