I don’t think Cubuntu is being continued. The last release was for 16.04.3 in 2016.
Whatever Cinnamon packages in Ubuntu repos or in Embrosyn’s ppa are old, so the Cinnamon Desktop you get from them would look old. Right now, Linux Mint has Cinnamon 4.0 and the changes are so much, I decided to install Mint 19.1 and move the repos to Disco. Also, moved Synaptic to stock Ubuntu version. Pretty neat and lovely, carefully crafted distro, made to be user friendly in every way.
Now, this Cinnamon Desktop is on Disco, it is somewhat changed from Mint 19.1, even though it still says so. The lsb-release can be changed (it doesn’t trouble me though), and the Linux mint repo will be unticked, so any changes there won’t kill the Disco. Any updates/upgrades would come only from Ubuntu repos.