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sudo apt-get updatebefore a package install ... and before removing a package. I.e. : Currently Ubuntu 16.04 receives updates every day .... will be more consistent in a few months. -apt-get install mono-devel(and apt is trying to upgrade it to the latest version). I don't see how you could get this error message if you were removingmono-devel. If this is really the output fromapt-get purge mono-devel, what doesapt-get -f installdo?/var/log/aptmight provide a clue.