Well, that was embarrassing...Thank you for finding my error. apt is able to find the packages now. Andy_ From: Guillaume Gay <guillaume@mitotic-machine.org<mailto:guillaume@mitotic-machine.org>> Reply-To: Main discussion list for the graph-tool project <graph-tool@skewed.de<mailto:graph-tool@skewed.de>> Date: Wednesday, October 15, 2014 1:46 PM To: Main discussion list for the graph-tool project <graph-tool@skewed.de<mailto:graph-tool@skewed.de>> Subject: Re: [graph-tool] apt-get fail to download index files You need to replace 'main' by 'universe' in your deb lines Le 15/10/2014 20:35, Andy Maloney a écrit : I am trying to install graph-tool on a Trusty Ubuntu virtualbox being hosted on a Mac. I've added the requisite lines deb http://downloads.skewed.de/apt/trusty trusty main deb-src http://downloads.skewed.de/apt/trusty trusty main to my /etc/apt/sources.list, but when I run a sudo apt-get update, I get the following errors: W: Failed to fetch http://downloads.skewed.de/apt/trusty/dists/trusty/Release Unable to find expected entry 'main/source/Sources' in Release file (Wrong sources.list entry or malformed file) E: Some index files failed to download. They have been ignored, or old ones used instead. I have the main, universe, and multiverse repositories available. If any one has come across this problem before, please let me know how to fix it. Thanks. Andy_ _______________________________________________ graph-tool mailing list graph-tool@skewed.de<mailto:graph-tool@skewed.de>http://lists.skewed.de/mailman/listinfo/graph-tool