Neil,
Thank you for your follow-up.
To answer your questions:
have you tried the JDBC driver for Ubuntu 18? mysql-connector-java_8.0.29-1ubuntu18.04_all.deb
from https://dev.mysql.com/downloads/connector/j/
No. I did not. The reason I didn't try that was because I saw in this post https ...

Hi Neil,
No. I do not have things working with a MySQL database yet. :(
Thank you for your suggestion to double-check renaming of the JDBC driver to driver.jar.
Yes. I have followed the directions provided and have placed the properly named driver.jar file into the Protege install root folder. (I ...

Hi. I have been attempting a multi-user installation by following the Multi User Installation Steps
I am getting the following error when executing the steps To use the database to host the repository:

Error dialog box: JDBC Driver not on classpath

Troubleshooting Attempted:
I have tried the ...