@cayhorstmann: that's exactly where my upgrade hangs.
And the visual effects grey out that window within a second or two.
I tried disabling all the third-party repos in synaptic, then I tried upgrading from the alt CD: same hanging at same place.
Next I tried removing third-party repos from synaptic, and now I'm trying to upgrade from the alt CD and it didn't hang at that same place. It asks if I want to check for the lastest online updates online and I click NO. But at the very next item on the checklist (as pictured in the above screenshot), it gave me the error message:
Could not calculate the upgrade
A unresolvable problem occurred while calculating the upgrade.
This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unofficial software packages not provided by Ubuntu
If none of this applies, then please report this bug against the 'update-manager' package and include the files in /var/log/dist-upgrade/ in the bugreport.
OK, and upgrade continues. Next time I see the screen, and all the signs of upgrade are gone, no windows or messages or alerts of completion though. But I see hundred of updates are available with the little star. I disable all online repos and force it to grab packages from CD. Now it's working on that, and once they've been installed, I'll switch back to online repos for the rest and hope it all works.
so in short, totally removing those third-party repos has let me get further in the upgrade with hiccups. It may even work now. I'll let you know once everything's installed and I restart the system.