revert an upgrade?

[Colin Law]

On 26 April 2014 12:26, Karl Auer <kauer at biplane.com.au> wrote:
> An almost-worst-case-scenario happened this morning - a power failure
> while upgrading Ubuntu on my laptop. The battery is failing (new one
> ordered), and when the power cable was inadvertently pulled - well, you
> get the picture.
>
> When I powered my laptop back up, I was faced with a grub prompt:
>
>    grub>
>
> A bit of googling, a bootable USB stick and a nifty program called
> boot-repair later, and I had a bootable system again. But not the latest
> version - I have to boot the *previous* kernel. If I try to boot the
> latest kernel, the splash screen is lo-res, I get a lo-res (but
> functional) greeter, and after I log in I just get a black screen with a
> visible (large) mouse cursor. Text consoles are still accessible via
> Alt-Ctl-F1 etc and they still work (but are also lo-res).
>
> I guess not everything got installed, or the install did not complete
> properly, or... something.
>
> So my question is, how can I "redo" the last set of updates?
> Specifically from kernel 3.11.0.19 to 3.11.0.20? Or back out the upgrade
> completely?

Have you tried
sudo apt-get update && sudo apt-get dist-upgrade

Colin