Sounds as if you have a borked Samba configuration.
> Have run apt-cache show samba4 and since I don't use it
> and did not seek to install it I attempted to purge it but
> still it clings on.
Open a terminal window and run
sudo apt-get purge samba4
** Changed in: samba4 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1072029
Title:
package samba4 (not installed) failed to install/upgrade: subprocess
installed post-installation script returned error exit status 255
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