Known issues with xorg upgrades from HWE stacks?

[Robie Basak]

On Tue, Nov 19, 2013 at 02:02:37PM +0200, Timo Aaltonen wrote:
> > I've heard various user stories about graphic stack failure upon
> > upgrade. Is this a known thing, and could this be an underlying cause?
> > Is this already a known bug?
> 
> Upgrading from a HWE backport stack to 12.10 is not supported.

OK, though in that case, how can we communicate this better? Have I
missed some obvious notice? I wonder how many others have hit the same
problem, unknowingly attempting an unsupported upgrade.

And shouldn't update-manager refuse to attempt an upgrade in this case?
Right now, the GUI allows me to attempt it and then things fail on
reboot.
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