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I am trying to install the build-essential package per the instructions located here:

I get this error when I use the command apt-get install build-essential:

Media change: please insert the disc labeled
 'Ubuntu 12.04.1 LTS _Precise Pangolin_ - Release i386 (20120817.3)'
in the drive '/cdrom/' and press enter

When attempting to install the package through the Ubuntu Software Center, I get the following error:

Is there any way to install the package online only?

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Probably the same "problem":… – Stefan Nov 1 '12 at 7:27
@Stefan Thanks, this solved my problem. If you wish to post your comment as an answer I'll be glad to rate it as the answer to this question. – Daniel K Nov 1 '12 at 12:23
just rate the answer on the other question, which was also mine : ) – Stefan Nov 1 '12 at 18:23
Haha I noticed this. However my reputation is too low (1 point) to do this. I'll just answer my own question, unless you'd like to put it in different words. Thanks for the help! – Daniel K Nov 1 '12 at 18:32
up vote 1 down vote accepted

From the Ubuntu Software Center select Edit -> Software Sources... from the menu bar. Under the first tab called Ubuntu Software, deselect the Installable from CD-ROM/DVD source, then close the window.

This answer is taken from Stefan Receiving "Please insert CD error" when trying to install xubuntu desktop in 12.04

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