Upgrading Dokku caused me to lose mysql db service

I upgraded dokku from the 3 series to 4. After upgrading my mysql db service is missing. Did I lose all the data from that database, or is there some way I can access it on my system?

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This question was answered by @gndo:

@kbhardwaj - First, make sure that your current mysql installation is accessible:

service mysql status   ### should display  that it is running
mysqlshow -u root -p  ### enter dbroot pw,  displays current databases if mysql is running

If the first command above failed, then you may need to check your packages

dpkg -l | grep mysql
## make sure you have a mysql-server package and note the version
dpkg --status mysql-server-YOURVERSIONHERE

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