https://www.turnkeylinux.org/forum/support/20160329/wordpress-appliance-root-user-cant-write-varwwwwordpress/
Wordpress appliance root user can't write to /var/www/wordpress | TurnKey GNU/Linux
Nearly 90 free ready-to-use system images for virtual machines, the cloud and bare metal
wordpress applianceroot usergnu linuxwritevar