# Remove the *Release* repository
$ sudo apt-add-repository --remove ppa:cubic-wizard/release
# Add the *Development* repository
$ sudo add-apt-repository ppa:cubic-wizard/development
# Install the *Development* version of Cubic
$ sudo apt update
$ sudo apt install cubic
(2)
Regarding the "cubic hung forever" issue you reported, I've opened Bug #1829593 to modify Cubic to provide better feedback during the long transition to the Options tab.
(1)
I've released a fix to the *Development* branch.
If you have some time, please test the fix for this issue in the *Development* branch, and let me know if it resolves your problem?
# Remove Cubic
$ sudo apt autoremove --purge cubic
# Remove the *Release* repository wizard/ release
$ sudo apt-add-repository --remove ppa:cubic-
# Add the *Development* repository wizard/ development
$ sudo add-apt-repository ppa:cubic-
# Install the *Development* version of Cubic
$ sudo apt update
$ sudo apt install cubic
(2)
Regarding the "cubic hung forever" issue you reported, I've opened Bug #1829593 to modify Cubic to provide better feedback during the long transition to the Options tab.