btalanski

1 - Add MySQL Source from the file
https://dev.mysql.com/downloads/repo/apt/

2 - Download and install libzip4 from url
https://ubuntu.pkgs.org/18.04/ubuntu-universe-amd64/libzip4_1.1.2-1.1_amd64.deb.html

3 - On a new terminal window run
sudo apt-get update && sudo apt-get upgrade

4 - Install mysql workbench

btalanski

If you are facing the following error while trying to connect to a MySQL server using the MySQL Workbench snap and Ubuntu Focal Fossa: "mysql workbench an apparmor policy prevents this sender [...]"

You might try the following solution:

1 - On a new terminal window, run the following commands:

# snap connect mysql-workbench-community:password-manager-service 
# snap connect mysql-workbench-community:ssh-keys

By using snap connect, you will fix the issue with the MySQL Workbench snap, allowing you to connect to the server(s).