mount: / is busy

[FAIL] Cannot check root file system because it is not mounted read-only. ... failed!

[ ok ] Activating lvm and md swap...done.

[....] Checking file systems...fsck from util-linux 2.29.2

fsck.ext4: No such file or directory while trying to open /dev/mmcblk0p5

Possibly non-existent device?

fsck exited with status code 8

failed (code 8).

[....] File system check failed. A log is being saved in /var/log/fsck/checkfs if that location is writable. Please repair t[FAILle system manually. ... failed!

[warn] A maintenance shell will now be started. CONTROL-D will terminate this shell and resume system boot. ... (warning).

Give root password for maintenance