Comment 12 for bug 1290460

I can confirm that at least one scenario works.

When booting from hard disk with Mythbuntu 14.04 amd64 installed:
- enable trusty-proposed
- update mythbuntu-common from 0.73 to 0.74
- use Mythbuntu Control Centre to install VNC, including setting the password
VNC is installed successfully and the password works after a reboot.

When booting from ISO into live environment:
- enable trusty-proposed
- update mythbuntu-common from 0.73 to 0.74
- disable trusty-proposed
- Use desktop icon to install Mythbuntu
the installation crashes with a different error:
Gtk-Message: Failed to load module "overlay-scrollbar"
Submitted this as bug 1320439, as an easy way to provide details.
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1320439

This crash does not happen if VNC is not ticked in the installation options.

Is anyone else able to confirm that updating mythbuntu-common from 0.73 to 0.74 in the live environment before installing to hard disk works? I can't figure out how to avoid this crash. If anyone is able to advise how to avoid this crash I'm happy to try testing again.