Can't build mysql.test as PPA is broken

[jamezpolley]

We're using https://launchpad.net/~ondrej/+archive/ubuntu/mysql-5.6 which has the description:

Don't use, it's broken.

When trying to set up mysql we get the following output:

Reading package lists...
Building dependency tree...
Reading state information...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 mysql-server-5.6 : Depends: mysql-client-5.6 (>= 5.6.35-1+deb.sury.org~xenial+0.1) but it is not going to be installed

[jamezpolley]

The official mysql apt repos don't offer 5.6. I can't find any other PPAs.

5.6 is what we're using in AWS.

I'm going to go ahead and set up my local test environment with 5.7 and see if we have compatibility issues.