After holding off for five months, testing the point one release on a test MythTV server, I decided to bite the bullet and upgrade from Mythbuntu 12.04LTS to 14.04.1 LTS on the basis that this point release has addressed all the initial bugs identified in 14.01LTS.
The good news is that this is true, except if you are using the MythTV Web interface which breaks as a result of the upgrade 
The cause of the problem is that the Apache web server configuration file is broken because MythTV 12.04LTS had Apache 2 2.2. and Mythbuntu 14.04.1LTS has 2.4. The supported syntax changed between Apache releases and prevents the Apache server for starting.
How to Fix
Open Terminal and do the following:
1. Delete the old configure file for Apache 2.2:
sudo rm /etc/apache2/sites-available/mythweb.conf
2. Reconfigure mythweb:
sudo dpkg-reconfigure mythweb
Unless you feel you need to, I would suggest that you do not choose the default of password protecting MythWeb
Unless you are sharing Apache on this server, select the default
Once configured you will be returned to the command prompt with the following message
Ignore the error message from Apache!
3. Restart the Apache webserver
sudo /etc/init.d/apache2 start
You will get the previous error message repeated, as before ignore!
If you now go to your web browser you should once again be able to access MythWeb 
The full details of the bug (#1307548) and alternative solutions if the above does not work can be found at https://bugs.launchpad.net/ubuntu/+source/mythtv/+bug/1307548
MyLinuxRamblings 
Thanks so much – perfect fix!