root@ubuntu:/# sudo dpkg -i '/libstdc++6_5.4.0-6ubuntu1~16.04.4_amd64.deb' 
sudo: unable to resolve host ubuntu
dpkg: warning: downgrading libstdc++6:amd64 from 6.2.0-3ubuntu11~14.04 to 5.4.0-6ubuntu1~16.04.4
(Reading database ... 1553862 files and directories currently installed.)
Preparing to unpack .../libstdc++6_5.4.0-6ubuntu1~16.04.4_amd64.deb ...
De-configuring libstdc++6:i386 (6.2.0-3ubuntu11~14.04) ...
Unpacking libstdc++6:amd64 (5.4.0-6ubuntu1~16.04.4) over (6.2.0-3ubuntu11~14.04) ...
dpkg: error processing package libstdc++6:amd64 (--install):
 package libstdc++6:amd64 5.4.0-6ubuntu1~16.04.4 cannot be configured because libstdc++6:i386 is at a different version (6.2.0-3ubuntu11~14.04)
dpkg: error processing package libstdc++6:i386 (--install):
 package libstdc++6:i386 6.2.0-3ubuntu11~14.04 cannot be configured because libstdc++6:amd64 is at a different version (5.4.0-6ubuntu1~16.04.4)
Processing triggers for libc-bin (2.23-0ubuntu5) ...
Errors were encountered while processing:
 libstdc++6:amd64
 libstdc++6:i386
root@ubuntu:/#