I had the same issue and fixed it by going to the control center and starting a console.
su [account] "the account that is set to auto launch mythbuntu"
gnome-screensaver-preferences "disable the screensaver at this point."
I had the same issue and fixed it by going to the control center and starting a console.
su [account] "the account that is set to auto launch mythbuntu"
gnome-screensav er-preferences "disable the screensaver at this point."