Recently I got a new PC and I ran into some errors when installing CQRLOG. This is my favorite logging program, after a little google-ing, I was able to find the solution. From what I gather, MariaDB is needed to store the database in a local file, and the Ubuntu packages defaulted to mySQL.

sudo apt install cqrlog
sudo apt install mariadb-client mariadb-server mariadb-common

If you launched CQRLOG first and got the ‘Mysql could not be started’ error, go to .config/CQRLOG and delete that folder (assuming no actual log data is there). Once the MariaDB packages are installed, launch again and it should work.