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This question already has an answer here:

This error could be caused by required additional software packages which are missing or not installable. Furthermore there could be a conflict between software packages which are not allowed to be installed at the same time.

The following packages have unmet dependencies:

steam-launcher: Depends: curl but it is not going to be installed

Depends: libc6 (>= 2.15) but 2.15-0ubuntu10.4 is to be installed

How do I get these? because with out them I can't run Steam

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marked as duplicate by Warren Hill, Alaa Ali, guntbert, Luis Alvarado Sep 24 '13 at 3:02

This question was marked as an exact duplicate of an existing question.

You probably need to enable Community-maintained free and open-source software (universe) in Software Sources, either via Ubuntu Software Center or Synaptic depending on which version of Ubuntu you're using.

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I use Ubuntu 12.04 LTS – Shawn Rose Sep 23 '13 at 13:06

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