Today I tried to upgrade my son's machine from 11.10 to 12.04. Things went generally ok except the unity panel and launcher and window decorations all went away. The attached information was from before the report, but during the upgrade. Unfortunately I will not be able to reproduce this as the machine will have been upgraded.
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ApportVersion: 1.91-0ubuntu1
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,snap,regex,compiztoolbox,imgpng,animation,expo,place,move,session,resize,grid,mousepoll,gnomecompat,vpswitch,workarounds,wall,ezoom,fade,scale,unityshell]
DistUpgraded: Log time: 2012-02-01 09:15:54.534747
DistroCodename: precise
DistroRelease: Ubuntu 12.04
DistroVariant: ubuntu
GraphicsCard:
Intel Corporation 82Q963/Q965 Integrated Graphics Controller [8086:2992] (rev 02) (prog-if 00 [VGA controller])
Subsystem: Intel Corporation Device [8086:4f43]
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
Package: unity 5.0.0-0ubuntu3
PackageArchitecture: i386
ProcEnviron:
LC_CTYPE=en_US.UTF-8
LC_COLLATE=en_US.UTF-8
LANG=en_US.UTF-8
LC_MESSAGES=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-15-generic-pae root=UUID=c646f9ef-dc15-4a2a-9dc9-649a5a03589a ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.0.0-15.26-generic-pae 3.0.13
Tags: precise running-unity ubuntu-une precise running-unity ubuntu-une precise running-unity ubuntu-une ubuntu single-occurrence
Uname: Linux 3.0.0-15-generic-pae i686
UpgradeStatus: Upgraded to precise on 2012-02-01 (0 days ago)
UserGroups: adm admin cdrom dialout fuse kvm libvirtd lpadmin plugdev sambashare vboxusers
dmi.bios.date: 08/04/2006
dmi.bios.vendor: Intel Corp.
dmi.bios.version: CO96510J.86A.4462.2006.0804.2059
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: DQ965GF
dmi.board.vendor: Intel Corporation
dmi.board.version: AAD41676-400
dmi.chassis.type: 2
dmi.modalias: dmi:bvnIntelCorp.:bvrCO96510J.86A.4462.2006.0804.2059:bd08/04/2006:svn:pn:pvr:rvnIntelCorporation:rnDQ965GF:rvrAAD41676-400:cvn:ct2:cvr:
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu8
version.libdrm2: libdrm2 2.4.30-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu4
version.xserver-xorg-core: xserver-xorg-core 2:1.11.3-0ubuntu9
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.99.901-1ubuntu3
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2
apport information