mythbuntu theme does not contain screen editstreampopup

[Caysho]

1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
pvruser@pvr:~$ lsb_release -rd
Description: Ubuntu 14.04.4 LTS
Release: 14.04

2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
pvruser@pvr:~$ apt-cache policy mythtv
mythtv:
  Installed: 2:0.28.0+fixes.20160506.0b08cb4-0ubuntu0mythbuntu5
  Candidate: 2:0.28.0+fixes.20160506.0b08cb4-0ubuntu0mythbuntu5
  Version table:
 *** 2:0.28.0+fixes.20160506.0b08cb4-0ubuntu0mythbuntu5 0
        500 http://ppa.launchpad.net/mythbuntu/0.28/ubuntu/ trusty/main i386 Packages
        100 /var/lib/dpkg/status
     2:0.27.0+fixes.20140324.8ee257c-0ubuntu3 0
        500 http://mirror.internode.on.net/pub/ubuntu/ubuntu/ trusty-updates/multiverse i386 Packages
     2:0.27.0+fixes.20140324.8ee257c-0ubuntu2 0
        500 http://mirror.internode.on.net/pub/ubuntu/ubuntu/ trusty/multiverse i386 Packages

Using the Mythbuntu theme.

3) What you expected to happen
Select Media Library, Listen to Radio Stream.
Press M for Menu, select the option to Add a stream.
Be presented with a search or a list of streams available to add to my set.

4) What happened instead
Select Media Library, Listen to Radio Stream.
I have none in the list.
Press M for Menu, I get the option to add a stream.
Nothing happens when I select this option.

The following is shown in the log file:

May 6 22:37:13 pvr mythfrontend.real: mythfrontend[9409]: E CoreContext streamview.cpp:695 (Create) Cannot load screen 'editstreampopup'

According to
https://code.mythtv.org/trac/ticket/12740
this means the theme has not been updated to make use of this feature.

Changing the theme to MythCenter-wide in the Theme Chooser allows me to add radio streams.

When I change it back to the Mythbuntu theme, the streams are available for use, but cannot be edited due to the screen not being available.