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After I got the Update manger ask me to update the kernel and after restar the only thing I got is a message with:

file can't be found...

and now the only way to boot is to chose the previews Linux in grub menu!

what should I do to fix this?

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what is the update kernel version? can you give some detail please – penreturns Sep 23 '12 at 8:17
I don't know but am sure it's the latest because I always do the update thing :) – Doctoa Sep 23 '12 at 8:33
use old kernel to boot, check my post here… – penreturns Sep 23 '12 at 8:36
Thanks a lot you're my saver :) – Doctoa Sep 23 '12 at 8:56
no problem! Enjoy ubuntu! – penreturns Sep 23 '12 at 8:57
up vote 3 down vote accepted

When grub show up, select old kernel.

Next, type the command below to view / list all installed kernels on your system.

dpkg --list | grep linux-image 

Find the newest kernel than your current kernel. When you know which kernel to remove, continue below to remove it.

sudo apt-get purge linux-image-x.x.x.x-generic 

Finally, run the commands below to update grub2

sudo update-grub2 

Reboot your system

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