The trick is to start with the raspbian-lite image - with NO gui. I have tried installing Mate over top of Raspbian with the LXDE desktop but there does not seem to be any way to select the desired environment. I believe this has to do with the window manager and I am not familiar with how to do that.
Regarding the "Could not connect to session bus" error... This occurs when I boot to the command line and then bring up the gui with
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sudo systemctl isolate graphical.target
The fix I posted was not really a fix. I believe I set the graphical.target as default and rebooted after re-installing what I thought was the offending package.
As to the man pages on Ubuntu Mate 18.04... I found a fix for that or at least a workaround.
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vim ~/.profile
and add the following line
export MAN_DISABLE_SECCOMP=1
If you want to give it a second try, burn the lite image to the card, boot the Pi, install "X Window System" mate-desktop-environment lightem and then sudo systemctl set-default graphical.target and reboot. That should do the trick. Feel free to post back if you have any questions.
Be aware that this process will provide the Mate interface but a lot of programs bundled by Ubuntu Mate are not present and will have to be installed manually.
Ken