Public bug reported:

The upgrade paused to ask me if I wanted to update my grub
configuration.  The screen eventually locked, I unlocked it to find the
dist-upgrade window and the grub update window, but both without window
decorations.  The grub window's button right corner was hidden (painted
over) by the dist-upgrade window.  I appeared to have no window manager
present (cf. next paragraph).

Clicking windows didn't change stacking order.  Keyboard input was being
ignored as far as I could tell.  Mouse interaction with still-live
things worked:  the scrollbar in the dist-upgrade window's terminal
session was fine.  Similarly, I was able to launch a terminal from the
desktop icon, but then I couldn't type to it.  On the other hand, right-
click in the terminal's content area allowed "close window", which
worked.

After an hour of (by then) intermittent random clicking and pressing of
return and escape, something dismissed the grub dialog and the install
continued.  I presume some mouse or keyboard event was by good luck
dispatched to the grub window.

The install appears to have completed correctly, in the sense that the
machine has now rebooted into something that looks like 10.10 and is
functional.  I'm filing this bug from the machine on which this all
occurred.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: update-manager 1:0.142.23.1
ProcVersionSignature: Ubuntu 2.6.35-31.63-generic 2.6.35.13
Uname: Linux 2.6.35-31-generic i686
Architecture: i386
Date: Fri Dec 30 11:17:21 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu-Netbook-Remix 9.10 "Karmic Koala" - Release i386 
(20091028.4)
PackageArchitecture: all
ProcEnviron:
 LC_TIME=en_GB.utf8
 PATH=(custom, user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: update-manager

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug distribution-upgrade i386 maverick ubuntu-une

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https://bugs.launchpad.net/bugs/910051

Title:
  lost window decorations during 10.04 -> 10.10 upgrade

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