#if you open your pc an it's saying that :
BusyBox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu4) built-in shell (ash)
Enter 'help' for a list of built-in commands.
(initramfs)
#type exit to see the problem :
BusyBox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu4) built-in shell (ash)
Enter 'help' for a list of built-in commands.
(initramfs) exit
/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.
#and type fsck and the root file system who's bug :
BusyBox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu4) built-in shell (ash)
Enter 'help' for a list of built-in commands.
(initramfs) fsck /dev/sda1
fsck from util-linux 2.27.1
e2fsck 1.42.13 (17-May-2015)
/dev/sda1 contains a file system with errors, check forced.
#Answer Y at all the questions and type reboot :
BusyBox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu4) built-in shell (ash)
Enter 'help' for a list of built-in commands.
(initramfs) reboot