Comment 58 for bug 186465

Thanks for the added information and sorry for the trouble.

@xfx: the while loop you see there shouldn't cause the behavior described here. If that hangs forever it will at least update the GUI. But it was indicated that the update-manager window is not redrawn.

@James: do-release-upgrade behaves slightly differently than update-manager, see http://wiki.ubuntu.com/UpdateManagerFaq

I tested a lot of different scenarios but I was not able to reporduce the problem here. If someone still can reproduce the hang, please contact me, I would like to provide you with a debug build of update-manager.