thunderbird segfault; will not start

[shinyblue]

Since apt-get dist-upgrade this morning (7 March, 8am GMT) thunderbird segfaults on launch :-(

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: thunderbird 11.0~b4+build1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-18.28-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
NonfreeKernelModules: wl
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.94-0ubuntu2
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: r 2053 F.... pulseaudio
 /dev/snd/controlC0: r 2053 F.... pulseaudio
BuildID: 20120302135656
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfc500000 irq 47'
   Mixer name : 'IDT 92HD73C1X5'
   Components : 'HDA:111d7675,102802be,00100103'
   Controls : 18
   Simple ctrls : 11
Card1.Amixer.info:
 Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfc010000 irq 48'
   Mixer name : 'ATI R6xx HDMI'
   Components : 'HDA:1002aa01,00aa0100,00100100'
   Controls : 6
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Channel: beta
CurrentDmesg:
 [ 50.616030] eth2: no IPv6 routers present
 [ 398.981265] type=1400 audit(1331110948.505:34): apparmor="DENIED" operation="chmod" parent=1 profile="/usr/bin/evince" name="/tmp/at-spi2/" pid=2475 comm="evince" requested_mask="w" denied_mask="w" fsuid=1000 ouid=104
 [ 424.548134] type=1400 audit(1331110974.073:35): apparmor="DENIED" operation="chmod" parent=1 profile="/usr/bin/evince" name="/tmp/at-spi2/" pid=2489 comm="evince" requested_mask="w" denied_mask="w" fsuid=1000 ouid=104
 [ 488.802017] process `skype' is using obsolete setsockopt SO_BSDCOMPAT
Date: Wed Mar 7 09:58:12 2012
ForcedLayersAccel: False
IfupdownConfig:
 auto lo
 iface lo inet loopback
IncompatibleExtensions:
 EDS Contact Integration - <email address hidden>, Version=0.3.9, minVersion=7.0, maxVersion=11.0a1, Location=app-global, Type=extension, Active=Yes
 Messaging Menu and Unity Launcher integration - <email address hidden>, Version=0.8, minVersion=3.3a1pre, maxVersion=10.*, Location=app-profile, Type=extension, Active=Yes
 Nostalgy - <email address hidden>, Version=0.2.27, minVersion=1.5, maxVersion=10.*, Location=app-profile, Type=extension, Active=Yes
 FolderFlags - ID={2bc419d0-6cf3-11da-8494-000a95be0946}, Version=1.2.4, minVersion=3.0, maxVersion=10.*, Location=app-profile, Type=extension, Active=Yes
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
IpRoute:
 default via 192.168.1.254 dev eth2 proto static
 169.254.0.0/16 dev eth2 scope link metric 1000
 192.168.1.0/24 dev eth2 proto kernel scope link src 192.168.1.73 metric 2
Profiles: Profile0 (Default) - LastVersion=11.0/20120302135656
RunningIncompatibleAddons: True
SourcePackage: thunderbird
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/03/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 0C234M
dmi.board.vendor: Dell Inc.
dmi.board.version: A07
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A07
dmi.modalias: dmi:bvnDellInc.:bvrA07:bd07/03/2009:svnDellInc.:pnStudio1555:pvrA07:rvnDellInc.:rn0C234M:rvrA07:cvnDellInc.:ct8:cvrA07:
dmi.product.name: Studio 1555
dmi.product.version: A07
dmi.sys.vendor: Dell Inc.