Fix error " /dev/sda1 was not cleanly unmounted, check forced " on Ubuntu Server

/dev/sda1 was not cleanly unmounted, check forced
10.2% non-contiguous
mountall: fsck /boot [286] terminated with status 1
---
Boot Ubuntu on recovery mode
---
#umount /dev/sda1
#if errors: -y auto answers yes for fixes needing response see man e2fsck
sudo e2fsck -f -y -v /dev/sda1