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I found this response in the Linux Mint forums: The reason for having these errors is that Mint 15 "Olivia" is no longer supported since January 2014. Mint 15 is obsolete and no longer supported. You need to either upgrade to Mint 17 if your system is not too old or install Mint 13. Both versions are LTS versions which stands for Long Term Support: Linux ...
Have you tried other sources? Either edit your sources.list and set another source (other than Ubuntu) or change it from your software GUI.
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