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Even though I'm sitting next to it, I log into my Ubuntu 10.04 LTS system via NX Free Edition from another system at the moment (this is temporary, not worth buying a KVM for). Curiously, though, when I do that Gnome's auto-mounting fails for CD/DVD media (I haven't tried other kinds) with a "Not Authorized" error. (When I put the media in the machine's own DVD drive, not the one on my client box.) For instance, when I put the Ubuntu 10.04 LTS installation CD in, I get this error:
Unable to mount Ubuntu 10.04 LTS amd64 - Not Authorized
This does not happen if I log into it locally (not via NX) with the same user account.
When using NX, I can mount the media if I go to mount directly:
tjc@midnight:~$ sudo mkdir /media/dvd
tjc@midnight:~$ sudo mount -r -t iso9660 /dev/sr0 /media/dvd
tjc@midnight:~$ ls /media/dvd
autorun.inf casper dists install isolinux md5sum.txt pics pool preseed README.diskdefines ubuntu wubi.exe
...which, along with the "not authorized" error, suggests some kind of permissions problem to me (doh). What I find odd is that the same user is involved in both cases (local and via NX).
I'm new to Ubuntu on the desktop (used it and other distros on servers for years), so I'm afraid I don't know how this auto-mounting is happening. I think it's handled by the gvfs package and its daemon, but that's about as far as I got (and perhaps I've taken a left turn even getting that far).
Although I can work around it with mount, does anyone know how I might get auto-mounting to work?
Update The nx user used by NX doesn't seem to be the issue. I wouldn't have expected it to be, since I'm logging in as myself, but I'm on unfamiliar ground. The only processes running as nx are:
nx 4484 4416 0 09:24 ? 00:00:00 sshd: nx@notty
nx 4568 1 0 09:24 ? 00:00:00 /usr/NX/bin/nxssh -nxservermode -l tjc localhost -p 22 -x -2 -i /usr/NX/etc/keys/node.localhost.id_dsa -o PubkeyAuthentication yes -o RSAAuthentication yes -o RhostsAuthentication no -o PasswordAuthentication no -o RhostsRSAAuthentication no -o StrictHostKeyChecking no /usr/NX/bin/nxnode
nx 4664 1 0 09:24 ? 00:00:00 nxserver -c /usr/NX/bin/nxserver --login
...where all the Gnome stuff is either running as me (tjc) or gdm. But just in case, I added nx to the cdrom group via usermod. When that didn't work, not being sure which services might want restarting, I just did the Windows thing and rebooted the machine entirely. No change. In fact, I temporarily added the nx user to all groups that tjc was a member of (except the tjc group), but that didn't do it either, so I think the nx user isn't the issue.
T.J. Crowder
Posted 2010-06-07T07:21:46.600
Reputation: 1 128
Thanks, but no luck (
usermod -a -G cdrom nx, then check in/etc/groupsthat it's been added, and not seeing a difference immediately and not being certain which services may need restarting, I did the Windows thing and rebooted the machine). There is annxuser, but all of the Gnome stuff (includinggvfsd) says it's running under eithergdmortjc(my login). The only processes running undernxare the SSH login andnxserver. I'll update the question. – T.J. Crowder – 2010-06-07T09:12:35.367(I tried all other groups
tjcwas a member of, too, just to be sure.) – T.J. Crowder – 2010-06-07T09:38:51.923@T.J. Crowder Is
tjca member ofcdrom? I just realized that you were usingsudoto mount it from the command line. Locally I think Ubuntu uses thepmountsystem, which might bypass said security, but also might not be set up for however nx id starting up gdm. – Darth Android – 2010-06-07T18:17:29.810tjcis a member ofcdrom, yes; but without thesudo,tjccan't manually mount the drive:mount -r -t iso9660 /dev/sr0 /home/tj/dvdresults in "mount: only root can do that". I don't think Ubuntu 10.04 usespmount(at least, I can't find anything withpmountanywhere in the name on my filesystem). – T.J. Crowder – 2010-06-08T00:02:57.653