On Fri, Jan 11, 2013 at 12:09 PM, Maurice Batey <maurice@bcs.org.uk> wrote:
>
> Is there any other way of getting back in again? > (I had got quite fond of Mga3...)
You should be able to boot the Beta1 installation media and select the Upgrade option.
It will go really fast because there's really nothing to upgrade and then the installer should rebuild the initrd(s) correctly.