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Pawel Debski
Asked: 2018-07-10 11:03:34 +0800 CST

Unable to mount Audio Disk: Message recipient disconnected from messages bus without replying

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When I insert audio CD I get the following message:

Unable to mount Audio Disk Message recipient disconnected from messages bus without replying

When I start Sound Juicer the following message appears:

Could not read the CD Sound Juicer could not read the track listing on this CD. Reason: Cannot access CD: The specified location is not mounted

For your info:

  • VLC can play the CD by selecting "Audio CD" and /dev/sr0, but the playback stops a few times and after a while computer hangs and hard reset is required (even ctrl-alt-F1 does not work)
  • the CD is not visible in Rhythmbox
  • other music CDs can be played and extracted with Sound Juicer on this machine without any problem
  • the CD I insert plays music in car CD drive without any problem
  • also Mac can play this CD and import it into iTunes, so I am sure physical media is ok

However when I insert various CDs into this machine I am getting following errors on console 1 (Shift-Alt-1):

Photo of Console-1 errors

I have gvfs-backends installed:

$ apt list --installed | grep gvfs

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

gvfs/xenial-updates,now 1.28.2-1ubuntu1~16.04.2 amd64 [installed]
gvfs-backends/xenial-updates,now 1.28.2-1ubuntu1~16.04.2 amd64 [installed]
gvfs-bin/xenial-updates,now 1.28.2-1ubuntu1~16.04.2 amd64 [installed]
gvfs-common/xenial-updates,xenial-updates,now 1.28.2-1ubuntu1~16.04.2 all [installed]
gvfs-daemons/xenial-updates,now 1.28.2-1ubuntu1~16.04.2 amd64 [installed]
gvfs-fuse/xenial-updates,now 1.28.2-1ubuntu1~16.04.2 amd64 [installed]
gvfs-libs/xenial-updates,now 1.28.2-1ubuntu1~16.04.2 amd64 [installed]

I also did the cdrom group correction as suggested by the answer below:

$ ls -l /dev/cdrom /dev/sr0
lrwxrwxrwx  1 root root      3 lip  9 21:53 /dev/cdrom -> sr0
brw-rw----+ 1 root cdrom 11, 0 lip  9 21:53 /dev/sr0
$ cat /etc/group | grep cdr
cdrom:x:24:someadmin
$ sudo adduser myuser cdrom
[sudo] password for myuser: 
Adding user `myuser' to group `cdrom' ...
Adding user myuser to group cdrom
Done.
$ cat /etc/group | grep cdr
cdrom:x:24:someadmin,myuser
...reboot...
$ id
uid=1001(myuser) gid=1001(myuser) groups=1001(myuser),24(cdrom),129(vboxusers),999(docker),1002(xcryptusers)

and the problem unfortunately persists.

cd mount cd-ripping audio-player

1 Answers

  1. If we look at /dev/cdrom, we see (on MY system, YMMV): 

    walt@bat:~(0)$ ls -l /dev/cdrom 
lrwxrwxrwx 1 root root 3 Jul  9 10:06 /dev/cdrom -> sr0 
walt@bat:~(0)$ ls -l /dev/cdrom /dev/sr0 
lrwxrwxrwx  1 root root      3 Jul  9 10:06 /dev/cdrom -> sr0 
brw-rw----+ 1 root cdrom 11, 0 Jul  9 10:06 /dev/sr0 
walt@bat:~(0)$

    that /dev/cdrom is a soft link to /dev/sr0, and that /dev/sr0 is owned by root:cdrom. /dev/sr0 is a block device, and allows rw (Read/Write) access to the owner (root) and members of the cdrom group. /dev/sr0 denies access to users who are neither root nor in the cdrom group.

    Use id to see if you are in the cdrom group. If not, read man adduser, and do: 

    sudo adduser $USER cdrom

    Then, the next time you login, all of your processes will have cdrom group membership, and rw access to /dev/cdrom -> /dev/sr0.

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