Comment 2 for bug 693226

It looks like either an issue with the media you were using to upgrade or drive. From Dmesg.txt:

[ 548.421174] sr1: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
[ 548.421398] sr 7:0:0:0: Attached scsi CD-ROM sr1
[ 548.421524] sr 7:0:0:0: Attached scsi generic sg3 type 5
[ 615.051186] sr 7:0:0:0: [sr1] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 615.051195] sr 7:0:0:0: [sr1] Sense Key : Illegal Request [current]
[ 615.051201] sr 7:0:0:0: [sr1] Add. Sense: Read of scrambled sector without authentication
[ 615.051213] sr 7:0:0:0: [sr1] CDB: Read(10): 28 00 00 1e 66 00 00 00 02 00
[ 615.051225] end_request: I/O error, dev sr1, sector 7968768
[ 615.051232] __ratelimit: 6 callbacks suppressed
[ 615.051236] Buffer I/O error on device sr1, logical block 996096
[ 615.055184] sr 7:0:0:0: [sr1] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 615.055191] sr 7:0:0:0: [sr1] Sense Key : Illegal Request [current]
[ 615.055197] sr 7:0:0:0: [sr1] Add. Sense: Read of scrambled sector without authentication
[ 615.055208] sr 7:0:0:0: [sr1] CDB: Read(10): 28 00 00 1e 66 00 00 00 02 00
[ 615.055220] end_request: I/O error, dev sr1, sector 7968768
[ 615.055227] Buffer I/O error on device sr1, logical block 996096
[ 615.762902] sr 7:0:0:0: [sr1] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 615.762910] sr 7:0:0:0: [sr1] Sense Key : Illegal Request [current]
[ 615.762916] sr 7:0:0:0: [sr1] Add. Sense: Read of scrambled sector without authentication
[ 615.762927] sr 7:0:0:0: [sr1] CDB: Read(10): 28 00 00 1e 65 de 00 00 02 00
[ 615.762938] end_request: I/O error, dev sr1, sector 7968632
[ 615.762946] Buffer I/O error on device sr1, logical block 996079
[ 615.772696] sr 7:0:0:0: [sr1] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 615.772705] sr 7:0:0:0: [sr1] Sense Key : Illegal Request [current]
[ 615.772712] sr 7:0:0:0: [sr1] Add. Sense: Read of scrambled sector without authentication
[ 615.772722] sr 7:0:0:0: [sr1] CDB: Read(10): 28 00 00 1e 65 de 00 00 02 00
[ 615.772734] end_request: I/O error, dev sr1, sector 7968632
[ 615.772741] Buffer I/O error on device sr1, logical block 996079
[ 616.598017] UDF-fs: Partition marked readonly; forcing readonly mount
[ 616.661551] UDF-fs INFO UDF: Mounting volume 'DVDVolume', timestamp 2036/02/07 01:58 (1000)