Each one of the Zentyal versión is bounded to one Ubuntu LTS version. Your system is probably broken because Zentyal uses the ubuntu packages provided by the Ubuntu host version and Zentyal 6.2 isn't prepared to run on Focal but on Bionics.
The next Zentyal version, which should be quickly released, will run on Ubuntu Focal, but it doesn't change your situation. Your system is broken.
I'm sorry but, IMHO, you have to make a fresh install of your Zentyal 6.2.
Cheers!