OK, my fix for this (unconfirmed but looks good.)
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I restored to a point before the issue.
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Installed MariaDB manually from their repository.
sudo apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xF1656F24C74CD1D8
sudo add-apt-repository ‘deb [arch=amd64,arm64,ppc64el] http://mirrors.accretive-networks.net/mariadb/repo/10.3/ubuntu bionic main’
sudo apt update
sudo apt install mariadb-server
==== Check version was Ver 15.1 Distrib 10.3.28-MariaDB
mysql -V
- Rebooted
- Ran ./daily.sh
5.Result (although will be back to confirm or ask for more help!)