GlenMH, thanks for taking the time to file this bug report.
This is the relevant error:
Preparing to replace smbclient 2:3.4.7~dfsg-1ubuntu3.6 (using
.../smbclient_2%3a3.5.4~dfsg-1ubuntu8.4_i386.deb) ...
Unpacking replacement smbclient ...
dpkg-deb (subprocess): data: internal gzip read error:
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https://bugs.launchpad.net/bugs/787312
Title:
package smbclient 2:3.4.7~dfsg-1ubuntu3.6 failed to install/upgrade:
subprocess dpkg-deb --fsys-tarfile returned error
