sam@home-pc:~$ sudo dpkg -i Downloads/libapt-pkg5.0_1.2.15ubuntu0.2_i386.deb 
dpkg: warning: downgrading libapt-pkg5.0:i386 from 1.5.1 to 1.2.15ubuntu0.2
(Reading database ... 405604 files and directories currently installed.)
Preparing to unpack .../libapt-pkg5.0_1.2.15ubuntu0.2_i386.deb ...
Unpacking libapt-pkg5.0:i386 (1.2.15ubuntu0.2) over (1.5.1) ...
dpkg: error processing archive Downloads/libapt-pkg5.0_1.2.15ubuntu0.2_i386.deb (--install):
 trying to overwrite shared '/usr/share/doc/libapt-pkg5.0/copyright', which is different from other instances of package libapt-pkg5.0:i386
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Processing triggers for libc-bin (2.26-0ubuntu2) ...
Errors were encountered while processing:
 Downloads/libapt-pkg5.0_1.2.15ubuntu0.2_i386.deb