I have problems after upgrading my older Ubuntu version to Ubuntu 14.04 lts. I was offered this installation and after the procss and restarting of the computer there is just a black page with following message:

mount: mounting /dev/loop0 on /root failed: Invalid argument
mount: mounting /dev on /root/dev failed: No such file or directory
mount: mounting /sys on /root/sys failed: No such file or directory
mount: mounting /proc on /root/proc failed: No such file or directory
Target filesystem doesn't have requested /sbin/init.
No init found. Try passing init= bootarg.

BusyBox v1.21.1 (Ubuntu 1:1.21.0-1ubuntu1) built-in shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs) _

The Windows which is installed on my laptop works normally. Thannk you very much for any answer.