Comment 6 for bug 1829553

(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
    $ 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.