Comment 115 for bug 149076

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Svartalf (frank-earlconsult) wrote :

Uh... This seems to be interrelated to how Ubuntu chose to automount the CD/DVD device. Problem occurs in more than just k3b/wodim. AcetoneISO doesn't work right. Other burning programs don't seem to work right. PSXE can't see legitimate PSX discs with this problem. Didn't occur with initial rollout of 12.04- but seems to have been triggered later on somewhere with one of the updates. If you explicitly unmount all mount instances of /dev/sr0 (mine had TWO differing, problematic mounts which explicitly referred to uid/gid) and things work properly for all instances- so long as you don't work with the "automatic" mount of the disc.

Basically, if it's not just a file tool or using the basic /media mount, you're dead in the water with any of it unless you explicitly UNMOUNT it and you need sudo access to do it with.