ubuntu 12.04 Blank Screen after reboot

[Unewbeginner]

hi there,

I tried to install ubuntu 12.04 on my hard drive with an usb flash drive. The install process looks fine, but when I reboot I got a black screen.

I tried to follow the post below:

http://ubuntuforums.org/showthread.php?t=1743535

I get into the system with the usb flash drive and mount my hard drive.


sudo mount /dev/sda2 /mnt
sudo chroot /mnt /bin/bash
sudo vi /etc/default/grub



and then I changed the grub options. but I'm stuck when I try to run "sudo update-grub", I got the message:


/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?)

How can I get this fixed?

[Unewbeginner]

mount proc
mount sys
mount dev

added the three lines after the chroot command, and then run the "update-grub", I can see the grub menu now.

[Bashing-om]

Unewbeginner; Hi ! Welcome to the forum.

At this time from the grub menu can you boot into ubuntu's desk top ?

awaiting to see what help is needed ==> BDQ

[Unewbeginner]

Unewbeginner; Hi ! Welcome to the forum.

At this time from the grub menu can you boot into ubuntu's desk top ?

awaiting to see what help is needed ==> BDQ



hi bashing-om. i fixed my ubuntu already. thanks! but i can't set up my dual boot grub2 for my windows drive. i already started another thread for this problem.