emsid@fractal:~$ man dpkg
emsid@fractal:~$ sudo dpkg -i --force-overwrite /var/cache/apt/archives/libgl1-mesa-dri-lts-xenial_11.2.0-1ubuntu2~trusty1_amd64.deb
[sudo] password for emsid: 
(Reading database ... 341487 files and directories currently installed.)
Preparing to unpack .../libgl1-mesa-dri-lts-xenial_11.2.0-1ubuntu2~trusty1_amd64.deb ...
Unpacking libgl1-mesa-dri-lts-xenial:amd64 (11.2.0-1ubuntu2~trusty1) ...
dpkg: warning: overriding problem because --force enabled:
dpkg: warning: trying to overwrite shared '/etc/drirc', which is different from other instances of package libgl1-mesa-dri-lts-xenial:amd64
Setting up libgl1-mesa-dri-lts-xenial:amd64 (11.2.0-1ubuntu2~trusty1) ...
Installing new version of config file /etc/drirc ...
emsid@fractal:~$