Can anyone help me how to disable the cdrom in Ubuntu 11.10 OS level.
I tried searching google but I could not find any solution.
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To remove a user [eg. john] from membership of a group [eg. accounts] use:
sudo deluser john accounts
And, to undo:
sudo adduser john accounts
So to match example (in other answer):
sudo deluser tachyons cdrom sudo adduser tachyons cdrom [to undo]