I found an old cd/dvd at my house and I inserted it in my laptop to find out its contents. The problem is that I cannot open it. It is visible under the "Devices" section but it won't mount. At some point it did mount but I could not access any file. They had a small lock icon. Judging from the contents, it must be a DVD since it had many different sort of files and folders. When I try ti mount the disc I get the aforementioned message.
I tried using some other discs which I found laying around at home and they worked just fine. They were CDs, containing only audio files. I tried using
sudo mount /dev/sr0 /mntbut it had no effect either. The process could not complete. I waited for about 10 mins waiting to mount so I aborted it.
Moreover, I am not asked whether I want to take any action when I enter a disc into the laptop. This happened to the audio discs too.
I would appreciate any help or suggestions.