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when I tried to install firestarter and the gnome shell, i get the following error:

CD/DVD 'Ubuntu 12.04.1 LTS Precise Pangolin - Release amd64 (20120823.1)' is required

Please insert the above CD/DVD into the drive '/cdrom/' to install software packages from it.

What should I do ?

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up vote 3 down vote accepted

You can either insert your DVD


remove cdrom as software source

To do that go to Ubuntu Software Center --> Edit menu --> choose software sources then uncheck the option installable from CD

enter image description here

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