root@ubuntu:/# sudo dpkg -i '/libstdc++6_5.4.0-6ubuntu1~16.04.4_amd64.deb' '/libstdc++6_5.4.0-6ubuntu1~16.04.4_i386.deb'
sudo: unable to resolve host ubuntu
(Reading database ... 1553870 files and directories currently installed.)
Preparing to unpack .../libstdc++6_5.4.0-6ubuntu1~16.04.4_amd64.deb ...
Unpacking libstdc++6:amd64 (5.4.0-6ubuntu1~16.04.4) over (5.4.0-6ubuntu1~16.04.4) ...
dpkg: warning: downgrading libstdc++6:i386 from 6.2.0-3ubuntu11~14.04 to 5.4.0-6ubuntu1~16.04.4
Preparing to unpack .../libstdc++6_5.4.0-6ubuntu1~16.04.4_i386.deb ...
Unpacking libstdc++6:i386 (5.4.0-6ubuntu1~16.04.4) over (6.2.0-3ubuntu11~14.04) ...
Setting up libstdc++6:amd64 (5.4.0-6ubuntu1~16.04.4) ...
dpkg: dependency problems prevent configuration of libstdc++6:i386:
 libstdc++6:i386 depends on gcc-5-base (= 5.4.0-6ubuntu1~16.04.4).

dpkg: error processing package libstdc++6:i386 (--install):
 dependency problems - leaving unconfigured
Processing triggers for libc-bin (2.23-0ubuntu5) ...
Errors were encountered while processing:
 libstdc++6:i386
root@ubuntu:/#