Today I opened my Ubuntu and I saw
What should I do ?
Lets check the file system to make sure there aren't any errors.
sudo fsck -f /
reboot
To check the hard disk for hardware errors...
Try Ubuntu
Disks
application from the Unity dashboardSMART Data & Tests
If this doesn't help, you're going to need to reinstall Ubuntu. Boot the Ubuntu Live DVD and choose Install Ubuntu
. Choose reinstall
, and make sure to uncheck the format partition selection, and it'll keep your existing /home directory.