The removal of the xorg-edgers ppa was executed as advised. But it seems
to have been the final nail in the coffin for my already fragile
graphical env. (which I have caused myself because I wanted to try
Steam and fiddled with propietary AMD/ATI drivers).
The good news was that it allowed me to
Reviewing the files from your upgrade attempt you seem to have enabled
the xorg-edgers-ppa. This will prevent the upgrade as that PPA contains
different versions of packages essential to Ubuntu. The page,
https://launchpad.net/~xorg-edgers/+archive/ppa, contains details on to
how to revert to the
