Comment 52 for bug 360460

Same problem with ubuntu-10.04-alternate-i386.iso (tried multiple CD-Rs, albeit of same brand). Maddeningly intermittent and then not, as #51 notes: I was able to install just fine on this machine last week, and now that I'm reinstalling from scratch the installer loops endlessly with the message:

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Please insert the disc labeled: 'Ubuntu 10.04 LTS _Lucid Lynx_ - Release i386 (20100427.1) in the drive '/cdrom/' and press enter.

Media change

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Go Back, Continue, Changing the disk etc are all ineffective. Looks like an endless loop.

I have restarted the installation 3 times now and it always gets stuck in the same spot.

Hardware:
Laptop: Fujitsu Siemenens S7020 Lifebook
Optical Drive: NEC DVD+-RW ND-6650A 1.5A PQ: 0 ANSI: 5
(recognized in dmesg as: sr0: scsi3-mmc drive: 24x24x writer cd/rw xa/form2 cdda tray)

The last messages of dmesg are:

sr 0:0:0:0: [sr0] Unhandled sense code
sr 0:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
sr 0:0:0:0: [sr0] Sense Key: Medium Error [current]
Info fld=0x6e
sr 0:0:0:0: [sr0] Add. Sense: No Seek complete
sr 0:0:0:0: [sr0] CDB: Read (10): 28 00 00 00 00 6e 00 00 01 00
end_request: I/O error, dev sr0, sector 440
ISOFS: unable to read i-node block

So it looks like a media error, but this is the 3rd CD I burn, and this is after the "Check CD for defects" has completed successfully on this CD...