can not mount /dev/loop0

[linlan hsieh]

Dear all, 
 
I received the following,
"(initramfs) mount: mounting /dev/loop0 on //filesystem.squashfs failed: Invalid argument.
Can not mount /dev/loop0 (/cdrom/casper/filesystem.squashfs) on //filesystem.squashfs."
aftter using a bootable USB drive boot. 
 
My Ubuntu 10.04 was working find with the bootable USB until I responded to upgrade to 11.04. Upgrading and killing failed. I forced to shot down my computer. However, the USB was not able to log in again since then. The USB was recovered and reinstalled and the computer was checked but I still cannot mount in as stated in the above statement.   
 
I looking forward to your kind supports. Thank you.
 
Sincerely yours,
Emily


 
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