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I am getting the "Could not find a suitable CD" error every time I open Software Sources in order to add a PPA. A picture can be found below:

IMAGE

How do I solve this problem? I am using Ubuntu 12.04

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I see your mouse is near Add volume. If you are clicking it, that is the wrong button. You need to click Add near the left instead. –  hexafraction Jun 4 '12 at 20:26

2 Answers 2

up vote 1 down vote accepted

I see your mouse is near Add volume. If you are clicking it, that is the wrong button. You need to click Add near the left instead.

The wise <code>Add</code> button

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I'm surprised this is upvoted. –  hexafraction Jun 4 '12 at 20:43

In that same tab from the screenshot, look for "Cdrom with Ubuntu 12.04 'Precise Pangolin'" and uncheck it. I had two of them in mine. After that it should work. Otherise, please post all of your external repos as there may be an issue with one of them:

tail -n +1 /etc/apt/sources.list.d/*

and

cat /etc/apt/sources.list
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