I am trying to install crossover for linux, on my Ubuntu 20.04 Mate installation, but the dependency python-gtk2 is missing.

sudo apt-get install python-gtk2 



Reading package lists... Done

Building dependency tree       

Reading state information... Done

Package python-gtk2 is not available, but is referred to by another package.

This may mean that the package is missing, has been obsoleted, or

is only available from another source



E: Package 'python-gtk2' has no installation candidate

I tried getting an older version for Ubuntu 18.04, but that wont install either.
it says the project is depreciated. That's all well and good, but I need it to run crossover.

what shall I do to satisfy this dependency?