I tried to install ubuntu 16.04 beta on my laptop which has ubuntu 14.04 installed 3 days before the official release. So I ran the command
do-release upgrade -d
The download went on well. But during installation, it started showing many errors and suddently the process stopped saying that "too many errors were encountered during the process". I did'nt know what to do. So I restarted the system. But the laptop failed to shutdown but showed a black screen with the led backlight still on. I had to force shutdown the system by pressing the power button. Then when I tried to turn on the system back, It came to black screen showing some errors which I have attached: I have windows 10 also installed on my system and grub seems be working properly but I really want to recover ubuntu which I use more often. Any help would appreciated. Thanks.