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Whenever I try to install a C++ library, ending with "-dev" I get an unmet dependecies alert that won't let me install the library, and the dependency is always already installed, the same thing happens with MuseScore

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Can you give us error message? –  Olcay Ertaş Feb 23 '13 at 20:05
The same happens with anything? –  Lucio Feb 23 '13 at 20:06
the error message is: Package dependencies cannot be resolved 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. (Details) The following packages have unmet dependencies: freeglut3-dev: Depends: freeglut3 (= 2.6.0-1ubuntu2) but 2.6.0-1ubuntu2 is to be installed –  hubbardh Feb 23 '13 at 20:41
oh and the same thing doesn't happen with anything, just MuseScore and development c++ libraries –  hubbardh Feb 23 '13 at 20:48
does sudo apt-get -f install help? If not run update and sudo apt-get clean, then sudo apt-get autoremove, finally sudo apt-get -f install. You can always set versions to install directly. In this case sudo apt-get install freeglut3=2.6.0-1ubuntu2 –  phipsalabim Feb 23 '13 at 22:43
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