Comment 88 for bug 249340

@ Big Dave :

Now that you are in 7.10, and want to upgrade to 8.04, just do the following:
1) Reboot and choose -14 kernel, not -15
2) Go to update manager, and choose upgrade
3) Answer all questions

Done! Not hangs, not crash, no problems!!!

I was lucky enough to upgrade after reading about this bug. The bug occurred to me while adding a language with the -15 kernel.

So, upgrading from the -14 kernel, goes flawlessly! (Hint: workaround)