Unable to Boot: error couldn't read file

Question

I have installed Ubuntu 12.04 LTS on an IBM Thinkpad T41.

Up until Linux 3.2.0-30 generic everything was working fine. I accept all the software update.

With 3.2.0-31 generic the machine freezes and I get the error:

error couldn't read file
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

With 3.2.0-32, the

error: Cannot read the Linux header

then the machine returns to the Grub menu

3.2.0-30 still works fine if I select that.

Answer 1

try boot-repair disk ,it solves many problems related to it https://help.ubuntu.com/community/Boot-Repair