fsck from util-linux 2.26.2
/dev/sda6 contains a file system with errors, check forced.
/dev/sda6: Inodes that were part of a corrupted orphan linked list found

/dev/sda6: UNEXPECTED INCOMSISTENCY; RUN fsck MANUALLY.
         (i.e., without -a or -p options)
fsck exited with status code 4
The root filesystem on /dev/sda6 requires a manual fsck

BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1) built-in shell (ash)
Enter 'help' für a list of built-in commands.

(initramfs)