I have also had this problem over the last couple of days. I'm
attempting to burn a copy of Fedora 9 for use on an old server machine.
My main machine is running Ubuntu 8.10. Have tried burning with Brasero
0.8.2. No errors received while burning the CD (have tried on three
different CD-RWs, not all from same manufacturer). Have also tried
downloading image using wget and bittorrent to try and ensure it is not
a corrupt image.

Error when mounting:
Unable to mount Fedora 9 i386 Disc 1
DBus error org.freedesktop.DBus.Error.NoReply: Did not receive a reply. 
Possible causes include: the remote application did not send a reply, the 
message bus security policy blocked the reply, the reply timeout expired, or 
the network connection was broken.

Note that I don't always see the error dialog, even though there are
errors reported in the syslog.

At first I thought the burner might be on its way out, but the same
message appears when the disc is loading into the secondary DVDROM
drive, so I can't be entirely sure.

Example from DVD-RW drive from /var/log/syslog:

Nov 22 14:56:58 SNIP kernel: [ 7398.249111] sr 5:0:0:0: [sr0] Sense Key : 
Hardware Error [current] 
Nov 22 14:56:58 SNIP kernel: [ 7398.249114] sr 5:0:0:0: [sr0] Add. Sense: 
Timeout on logical unit
Nov 22 14:56:58 SNIP kernel: [ 7398.249120] end_request: I/O error, dev sr0, 
sector 1247136
Nov 22 14:56:58 SNIP kernel: [ 7398.249126] Buffer I/O error on device sr0, 
logical block 155892
Nov 22 14:57:04 SNIP kernel: [ 7404.695255] sr 5:0:0:0: [sr0] Result: 
hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK

Example from DVDROM drive from /var/log/sys:

Nov 22 15:01:39 SNIP kernel: [ 7679.224709] sr 5:0:1:0: [sr1] Result: 
hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
Nov 22 15:01:39 SNIP kernel: [ 7679.224717] sr 5:0:1:0: [sr1] Sense Key : 
Medium Error [current] 
Nov 22 15:01:39 SNIP kernel: [ 7679.224720] sr 5:0:1:0: [sr1] Add. Sense: CIRC 
unrecovered error
Nov 22 15:01:39 SNIP kernel: [ 7679.224724] end_request: I/O error, dev sr1, 
sector 1247136
Nov 22 15:01:39 SNIP kernel: [ 7679.224729] Buffer I/O error on device sr1, 
logical block 155892
Nov 22 15:01:41 SNIP kernel: [ 7681.744514] end_request: I/O error, dev sr1, 
sector 1247136
Nov 22 15:01:41 SNIP kernel: [ 7681.744524] Buffer I/O error on device sr1, 
logical block 155892
Nov 22 15:01:42 SNIP kernel: [ 7682.008009] end_request: I/O error, dev sr1, 
sector 1247136
Nov 22 15:01:42 SNIP kernel: [ 7682.008016] Buffer I/O error on device sr1, 
logical block 155892
Nov 22 15:01:42 SNIP kernel: [ 7682.212668] end_request: I/O error, dev sr1, 
sector 1247136
Nov 22 15:01:42 SNIP kernel: [ 7682.212673] Buffer I/O error on device sr1, 
logical block 155892
Nov 22 15:01:42 SNIP kernel: [ 7682.397582] end_request: I/O error, dev sr1, 
sector 1247136
Nov 22 15:01:42 SNIP kernel: [ 7682.397592] Buffer I/O error on device sr1, 
logical block 155892
Nov 22 15:01:42 SNIP kernel: [ 7682.562355] end_request: I/O error, dev sr1, 
sector 1247136
Nov 22 15:01:42 SNIP kernel: [ 7682.562361] Buffer I/O error on device sr1, 
logical block 155892
Nov 22 15:01:43 SNIP kernel: [ 7682.785031] end_request: I/O error, dev sr1, 
sector 1247136
Nov 22 15:01:43 SNIP kernel: [ 7682.785036] Buffer I/O error on device sr1, 
logical block 155892
Nov 22 15:01:43 SNIP kernel: [ 7683.055594] end_request: I/O error, dev sr1, 
sector 1247136
Nov 22 15:01:43 SNIP kernel: [ 7683.055601] Buffer I/O error on device sr1, 
logical block 155892
Nov 22 15:01:43 SNIP kernel: [ 7683.206523] end_request: I/O error, dev sr1, 
sector 1247136
Nov 22 15:01:43 SNIP kernel: [ 7683.206531] Buffer I/O error on device sr1, 
logical block 155892
Nov 22 15:01:43 SNIP kernel: [ 7683.443418] UDF-fs: No VRS found
Nov 22 15:01:43 SNIP kernel: [ 7683.454701] ISO 9660 Extensions: Microsoft 
Joliet Level 3
Nov 22 15:01:43 SNIP kernel: [ 7683.519704] ISO 9660 Extensions: RRIP_1991A

Note that the sectors that cause the error are the same on both drives...
I'm not 100% convinced this is a bug as I've seen DVD-RW just keel over and die 
in the past. It'd be nice to have confirmation that it's definitely the 
hardware before I replace the unit though.

A few others have reported receiving similar DBUS errors (this week) here:
http://ubuntuforums.org/showthread.php?p=6214711

-- 
ISO burn on Intrepid with Brasero will not mount
https://bugs.launchpad.net/bugs/295795
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