Installation fails without further explanation at "Select and install software"

[Lars Noodén]

The installation appears to progress normally but fails at the step "select and install software"

1. Download Alternate amd+mac image: http://iso.qa.ubuntu.com/qatracker/milestones/214/builds/15994/testcases
2. Verify md5 sums
3. Burn to CD-RW
4. Verify burn
5. Progress through installation

I have tried with two different media. The Desktop image from the same time installs just fine, so did earlier Alternate images.

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/988263

[Brian Murray (brian-murray)]

The syslog indicates a problem with the CD:

Apr 25 10:24:55 kernel: [ 854.962626] sr 0:0:0:0: [sr0] Unhandled sense code
Apr 25 10:24:55 kernel: [ 854.962633] sr 0:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr 25 10:24:55 kernel: [ 854.962642] sr 0:0:0:0: [sr0] Sense Key : Medium Error [current]
Apr 25 10:24:55 kernel: [ 854.962651] Info fld=0x55458
Apr 25 10:24:55 kernel: [ 854.962655] sr 0:0:0:0: [sr0] Add. Sense: L-EC uncorrectable error
Apr 25 10:24:55 kernel: [ 854.962664] sr 0:0:0:0: [sr0] CDB: Read(10): 28 00 00 05 54 57 00 00 02 00
Apr 25 10:24:55 kernel: [ 854.962683] end_request: I/O error, dev sr0, sector 1397088
Apr 25 10:24:56 kernel: [ 856.455459] sr 0:0:0:0: [sr0] Unhandled sense code
Apr 25 10:24:56 kernel: [ 856.455466] sr 0:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr 25 10:24:56 kernel: [ 856.455475] sr 0:0:0:0: [sr0] Sense Key : Medium Error [current]
Apr 25 10:24:56 kernel: [ 856.455483] Info fld=0x55364

[Brian Murray (brian-murray)]

Could you try burning it again or perhaps using a CDR instead of an CDRW?

[Lars Noodén (larsnooden)]

Yes. I had even tried switching CDs. One of them was even brand new. The image checksum was ok and the burn verified, so maybe the optical drive was overheated. They work ok today. Yesterday, I had done the Alternate *after* running all four Desktop tests, they use the optical drive intensively. Also even though the machine seems to run a little hot under Linux, the fan does not run fast. Maybe those factors combined made for failure.

[Lars Noodén (larsnooden)]

Today the drive is reading all of the CDRW I throw at it. Maybe it was a temperature thing.