My computer froze. I turned it off and it re-booted with this error:
/dev/sda2 contains a file system with errors, check forced. Inodes that were part of a corrupt orphan linked list found. /dev/sda2: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY. Fsck exited with status code 4.
Please explain it to me what I need to do simply, as I am really new to Ubuntu.