I booted into 2.6.28-11
$ uname -rv
2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:58:03 UTC 2009

# modprobe udf
# mount -t udf /dev/sr0 /media/cdrom0/
mount: block device /dev/sr0 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/sr0,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so
# mount /dev/sr0 /media/cdrom0 -t udf -o 
ro,user,noauto,exec,umask=0,session=0,lastblock=1
mount: wrong fs type, bad option, bad superblock on /dev/sr0,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

It seems that udf module is loaded.
# lsmod | grep udf
udf                    92584  0
crc_itu_t              10496  1 udf
#

# dmesg | tail
[  515.908073] end_request: I/O error, dev sr0, sector 0
[  515.911255] end_request: I/O error, dev sr0, sector 8
[  515.914522] end_request: I/O error, dev sr0, sector 1248
[  515.917738] end_request: I/O error, dev sr0, sector 2496
[  515.921450] end_request: I/O error, dev sr0, sector 4
[  515.924617] end_request: I/O error, dev sr0, sector 0
[  515.927853] end_request: I/O error, dev sr0, sector 8
[  515.931434] end_request: I/O error, dev sr0, sector 1248
[  515.934830] end_request: I/O error, dev sr0, sector 2496
[  515.934978] UDF-fs: No partition found (1)

-- 
The system doesn't recognise and auto-mount cdrom when cd was burned in Windows.
https://bugs.launchpad.net/bugs/377373
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