$ sudo dpkg -i chromium-browser_45.0.2454.101-0ubuntu1.1201_amd64.deb
Selecting previously unselected package chromium-browser.
(Reading database ... 179727 files and directories currently installed.)
Preparing to unpack chromium-browser_45.0.2454.101-0ubuntu1.1201_amd64.deb ...
Unpacking chromium-browser (45.0.2454.101-0ubuntu1.1201) ...
dpkg: dependency problems prevent configuration of chromium-browser:
 chromium-browser depends on chromium-codecs-ffmpeg-extra (= 45.0.2454.101-0ubuntu1.1201) | chromium-codecs-ffmpeg (= 45.0.2454.101-0ubuntu1.1201); however:
  Version of chromium-codecs-ffmpeg-extra on system is 47.0.2526.73-0ubuntu0.15.10.1.1215.
  Package chromium-codecs-ffmpeg is not installed.

dpkg: error processing package chromium-browser (--install):
 dependency problems - leaving unconfigured
Processing triggers for hicolor-icon-theme (0.15-0ubuntu1) ...
Processing triggers for man-db (2.7.4-1) ...
Processing triggers for gnome-menus (3.13.3-6ubuntu1) ...
Processing triggers for desktop-file-utils (0.22-1ubuntu3) ...
Processing triggers for bamfdaemon (0.5.2~bzr0+15.10.20150627.1-0ubuntu1) ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for mime-support (3.58ubuntu1) ...
Errors were encountered while processing:
 chromium-browser


sun@sun-Alienware-X51:~/Downloads$ sudo apt-get install chromium-codecs-ffmpeg
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 chromium-browser : Depends: chromium-codecs-ffmpeg-extra (= 45.0.2454.101-0ubuntu1.1201) but 47.0.2526.73-0ubuntu0.15.10.1.1215 is to be installed or
                             chromium-codecs-ffmpeg (= 45.0.2454.101-0ubuntu1.1201) but 47.0.2526.73-0ubuntu0.15.10.1.1215 is to be installed
                    Recommends: chromium-browser-l10n but it is not going to be installed
 chromium-codecs-ffmpeg : Conflicts: chromium-codecs-ffmpeg-extra but 47.0.2526.73-0ubuntu0.15.10.1.1215 is to be installed
 chromium-codecs-ffmpeg-extra : Conflicts: chromium-codecs-ffmpeg but 47.0.2526.73-0ubuntu0.15.10.1.1215 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).