This question already has an answer here:
After booting into Ubuntu this shows up
/dev/sda1 contains a file system with errors, check forced. Inodes that were part of a corrupted orphan linked list found. /dev/sda1: 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 BusyBox v1.22.1 (Ubuntu 1:1.22.0-19ubuntuu2) built-in shell (ash) Enter 'help' for a list of built-in commands. (initramfs)_
What should I do?