*** This bug is a duplicate of bug 1069133 ***
https://bugs.launchpad.net/bugs/1069133
Ah, thanks. Turns out it was oibaf/graphics-drivers that needed purging
out, and then it was happy to attempt the upgrade. Ta.
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Bugs,
*** This bug is a duplicate of bug 1069133 ***
https://bugs.launchpad.net/bugs/1069133
Reviewing the files from your upgrade attempt you seem to have enabled a
PPA that provides Xorg packages. This will prevent the upgrade as that
PPA contains different versions of packages essential to Ubuntu
