Homeserver fails to boot after power outage

(Initramfs): /dev/sda2 contains a file system with errors, check forced.
  Inodes that were a part of a corrupted orphan linked lost found.
  /dev/sda2 : UNEXPECTED INCONSISTENCY; RUN fsck manually.(I.e .,
  without -a or -p options). fsck exited with status code 4. The root
  filesystem on /dev/sda1 requires a manual fsck

solution

fsck -yf /dev/sda2

Src: https://askubuntu.com/questions/885062/root-file-system-requires-manual-fsck#885066