The problem is that invoke-rc.d is not invoking mysql's start-stop script properly. Swapping 'invoke-rc.d' for 'service' in invoke() makes the script succeed. My system is now correctly configured.
The problem is that invoke-rc.d is not invoking mysql's start-stop script properly. Swapping 'invoke-rc.d' for 'service' in invoke() makes the script succeed. My system is now correctly configured.