Al reiniciar mi portatil que tiene instalado UBUNTU 16.04 aparece el siguiente mensaje de error:

/dev/sda1 contains a file system with errors, check forced.
Inode 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 1:1.22.0-15ubuntu1) built-in shell (ash)
Enter "help" for a list of built-in commands.

(initramfs)