On boot up I got a 'Kernel panic - not syncing' message and it halted. On a cold reboot it worked fine again.

The problem appears to have occurred before anything could be logged, as I understand this problem relates to the init process so I guess it didn't get far enough. I've not had the problem before and my system has been very stable since upgrading to 10.04 in April.

Sorry I can't provide any better information.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-26-generic 2.6.32-26.47
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.32-26.47-generic 2.6.32.24+drm33.11
Uname: Linux 2.6.32-26-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: r-hind 1612 F.... pulseaudio
 /dev/snd/controlC1: r-hind 1612 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'SIS966'/'HDA SIS966 at 0xfe9f8000 irq 18'
   Mixer name : 'Analog Devices AD1984A'
   Components : 'HDA:11d4194a,102802c3,00100400'
   Controls : 34
   Simple ctrls : 20
Card1.Amixer.info:
 Card hw:1 'UA1A'/'Roland EDIROL UA-1A at usb-0000:00:03.1-2, full speed'
   Mixer name : 'USB Mixer'
   Components : 'USB0582:0018'
   Controls : 0
   Simple ctrls : 0
Card1.Amixer.values:

CheckboxSubmission: 779b1db77240ffa294b33b31feedf933
CheckboxSystem: 2a6f54df59af338184485e85cbcf0d32
Date: Wed Dec 22 14:17:27 2010
Frequency: This has only happened once.
HibernationDevice: RESUME=UUID=21017e64-18d3-4d72-979a-81f3c4fbf182
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.

 eth1 no wireless extensions.
MachineType: Dell Inc. OptiPlex 160
ProcCmdLine: root=UUID=a129c2df-e194-49df-a91f-1e7b28c639d2 ro quiet splash
ProcEnviron:
 LANG=en_GB.utf8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.34.1
RfKill:

SourcePackage: linux
WpaSupplicantLog:

dmi.bios.date: 12/23/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A01
dmi.board.name: 0F259F
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: dmi:bvnDellInc.:bvrA01:bd12/23/2008:svnDellInc.:pnOptiPlex160:pvrNotSpecified:rvnDellInc.:rn0F259F:rvrA01:cvnDellInc.:ct3:cvrNotSpecified:
dmi.product.name: OptiPlex 160
dmi.product.version: Not Specified
dmi.sys.vendor: Dell Inc.