sudo apt-get install mercurial mercurial-common

The following packages have unmet dependencies:
 mercurial : Depends: mercurial-common (= 4.0.2~trusty1) but 4.1~rc~trusty1 is to be installed
 mercurial-common : Recommends: mercurial (= 4.1~rc~trusty1) but 4.0.2~trusty1 is to be installed
                    Breaks: mercurial (< 4.1~rc~trusty1) but 4.0.2~trusty1 is to be installed
E: Unable to correct problems, you have held broken packages.