> Don't use scd0 but cdrom. We have not the same device. OK. Changed. # cdrom /dev/cdrom /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0 > Windows use a standard derived from iso9660, Joliet, but it is managed by Ubuntu (except if you disable it). I haven't changed anything here. It fresh installation. > Could you try with a commercial CD (not burnt)? Yes, I already tried it. CD was not auto-mounted. > The burnt CD which fails with 9.04 worked with previous version (try an old CD) ? Yes, I tried the same CDs on my other machine - Ubuntu 8.10, and it worked fine (CD was auto-mounted and pop up windows appeared - what I want to do with CD) > Try" sudo mount /media/cdrom0" to get a error message, and then "dmesg|tail". $ sudo mount /media/cdrom0 [sudo] password for wewek: 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 $ $ dmesg | tail [ 678.752736] end_request: I/O error, dev sr0, sector 64 [ 681.592384] end_request: I/O error, dev sr0, sector 1424292 [ 681.595777] end_request: I/O error, dev sr0, sector 1423268 [ 681.598750] end_request: I/O error, dev sr0, sector 1424288 [ 681.601788] end_request: I/O error, dev sr0, sector 1423264 [ 681.605110] end_request: I/O error, dev sr0, sector 1424284 [ 681.608634] end_request: I/O error, dev sr0, sector 1423260 [ 681.611956] end_request: I/O error, dev sr0, sector 1423692 [ 681.615505] end_request: I/O error, dev sr0, sector 1422668 [ 681.618958] end_request: I/O error, dev sr0, sector 1423684 [ 681.622197] end_request: I/O error, dev sr0, sector 1422660 [ 681.625577] end_request: I/O error, dev sr0, sector 1024 [ 681.629046] end_request: I/O error, dev sr0, sector 2048 [ 681.632983] end_request: I/O error, dev sr0, sector 1424292 [ 681.636449] end_request: I/O error, dev sr0, sector 1423044 [ 681.639899] end_request: I/O error, dev sr0, sector 1424288 [ 681.643166] end_request: I/O error, dev sr0, sector 1423040 [ 681.646425] end_request: I/O error, dev sr0, sector 1423048 [ 681.649692] end_request: I/O error, dev sr0, sector 1424284 [ 681.652690] end_request: I/O error, dev sr0, sector 1423036 [ 681.655975] end_request: I/O error, dev sr0, sector 1423552 [ 681.659321] end_request: I/O error, dev sr0, sector 1422304 [ 681.662655] end_request: I/O error, dev sr0, sector 1423544 [ 681.665770] end_request: I/O error, dev sr0, sector 1422296 [ 681.669069] end_request: I/O error, dev sr0, sector 1248 [ 681.672496] end_request: I/O error, dev sr0, sector 2496 [ 681.675628] end_request: I/O error, dev sr0, sector 1248 [ 681.678665] end_request: I/O error, dev sr0, sector 2496 [ 681.678687] UDF-fs: No partition found (1) [ 681.802160] end_request: I/O error, dev sr0, sector 64 [ 681.802227] isofs_fill_super: bread failed, dev=sr0, iso_blknum=16, block=16 $ grep sr0 /var/log/syslog May 22 23:00:50 napsugaram kernel: [36631.903812] end_request: I/O error, dev sr0, sector 0 May 22 23:00:50 napsugaram kernel: [36631.903824] Buffer I/O error on device sr0, logical block 0 May 22 23:00:50 napsugaram kernel: [36631.903837] Buffer I/O error on device sr0, logical block 1 May 22 23:00:50 napsugaram kernel: [36631.903843] Buffer I/O error on device sr0, logical block 2 May 22 23:00:50 napsugaram kernel: [36631.903849] Buffer I/O error on device sr0, logical block 3 May 22 23:00:50 napsugaram kernel: [36631.907085] end_request: I/O error, dev sr0, sector 0 May 22 23:00:50 napsugaram kernel: [36631.907092] Buffer I/O error on device sr0, logical block 0 May 23 00:11:33 napsugaram kernel: [ 2.313161] sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray May 23 00:11:33 napsugaram kernel: [ 2.313220] sr 3:0:0:0: Attached scsi CD-ROM sr0 May 23 00:12:45 napsugaram kernel: [ 84.444556] end_request: I/O error, dev sr0, sector 0 May 23 00:12:45 napsugaram kernel: [ 84.444566] Buffer I/O error on device sr0, logical block 0 May 23 00:12:45 napsugaram kernel: [ 84.444577] Buffer I/O error on device sr0, logical block 1 May 23 00:12:45 napsugaram kernel: [ 84.444583] Buffer I/O error on device sr0, logical block 2 May 23 00:12:45 napsugaram kernel: [ 84.444588] Buffer I/O error on device sr0, logical block 3 May 23 00:12:45 napsugaram kernel: [ 84.450568] end_request: I/O error, dev sr0, sector 0 May 23 00:12:45 napsugaram kernel: [ 84.450576] Buffer I/O error on device sr0, logical block 0 May 23 00:22:39 napsugaram kernel: [ 678.752736] end_request: I/O error, dev sr0, sector 64 May 23 00:22:42 napsugaram kernel: [ 681.592384] end_request: I/O error, dev sr0, sector 1424292 May 23 00:22:42 napsugaram kernel: [ 681.595777] end_request: I/O error, dev sr0, sector 1423268 May 23 00:22:42 napsugaram kernel: [ 681.598750] end_request: I/O error, dev sr0, sector 1424288 May 23 00:22:42 napsugaram kernel: [ 681.601788] end_request: I/O error, dev sr0, sector 1423264 May 23 00:22:42 napsugaram kernel: [ 681.605110] end_request: I/O error, dev sr0, sector 1424284 May 23 00:22:42 napsugaram kernel: [ 681.608634] end_request: I/O error, dev sr0, sector 1423260 May 23 00:22:42 napsugaram kernel: [ 681.611956] end_request: I/O error, dev sr0, sector 1423692 May 23 00:22:42 napsugaram kernel: [ 681.615505] end_request: I/O error, dev sr0, sector 1422668 May 23 00:22:42 napsugaram kernel: [ 681.618958] end_request: I/O error, dev sr0, sector 1423684 May 23 00:22:42 napsugaram kernel: [ 681.622197] end_request: I/O error, dev sr0, sector 1422660 May 23 00:22:42 napsugaram kernel: [ 681.625577] end_request: I/O error, dev sr0, sector 1024 May 23 00:22:42 napsugaram kernel: [ 681.629046] end_request: I/O error, dev sr0, sector 2048 May 23 00:22:42 napsugaram kernel: [ 681.632983] end_request: I/O error, dev sr0, sector 1424292 May 23 00:22:42 napsugaram kernel: [ 681.636449] end_request: I/O error, dev sr0, sector 1423044 May 23 00:22:42 napsugaram kernel: [ 681.639899] end_request: I/O error, dev sr0, sector 1424288 May 23 00:22:42 napsugaram kernel: [ 681.643166] end_request: I/O error, dev sr0, sector 1423040 May 23 00:22:42 napsugaram kernel: [ 681.646425] end_request: I/O error, dev sr0, sector 1423048 May 23 00:22:42 napsugaram kernel: [ 681.649692] end_request: I/O error, dev sr0, sector 1424284 May 23 00:22:42 napsugaram kernel: [ 681.652690] end_request: I/O error, dev sr0, sector 1423036 May 23 00:22:42 napsugaram kernel: [ 681.655975] end_request: I/O error, dev sr0, sector 1423552 May 23 00:22:42 napsugaram kernel: [ 681.659321] end_request: I/O error, dev sr0, sector 1422304 May 23 00:22:42 napsugaram kernel: [ 681.662655] end_request: I/O error, dev sr0, sector 1423544 May 23 00:22:42 napsugaram kernel: [ 681.665770] end_request: I/O error, dev sr0, sector 1422296 May 23 00:22:42 napsugaram kernel: [ 681.669069] end_request: I/O error, dev sr0, sector 1248 May 23 00:22:42 napsugaram kernel: [ 681.672496] end_request: I/O error, dev sr0, sector 2496 May 23 00:22:42 napsugaram kernel: [ 681.675628] end_request: I/O error, dev sr0, sector 1248 May 23 00:22:42 napsugaram kernel: [ 681.678665] end_request: I/O error, dev sr0, sector 2496 May 23 00:22:42 napsugaram kernel: [ 681.802160] end_request: I/O error, dev sr0, sector 64 May 23 00:22:42 napsugaram kernel: [ 681.802227] isofs_fill_super: bread failed, dev=sr0, iso_blknum=16, block=16 > Prehaps duplicate of https://bugs.launchpad.net/ubuntu/+source/linux/+bug/106910, there were problem with CD at UDF standard. Yes. it looks pretty similar but error message is little bit different here: UDF-fs: No fileset found - UDF-fs: No partition found (1) The fix was already delivered for #106910, so I suggest to track this bug separately and specially for Kubuntu.