===== File System Check =====

* Press **Ctrl+Alt+F1**

* Enter login name: <code>mycnc</code> press Enter

* Enter password: <code>operator</code>, press Enter

* Run File system check utility - 
<code>
sudo   fsck   -y   /dev/sda5
</code>

* Reboot computer
<code>
sudo   reboot
</code>, press Enter