Virtual Box: Autostart on System Boot (Linux)

VBoxManage: error: Adding machine ‘Ubuntu-VM’ to the autostart database failed with VERR_ACCESS_DENIED If you this error message, manually create <userid>.start file under /etc/vbox

echo -e "VBOXAUTOSTART_DB=/etc/vbox\nVBOXAUTOSTART_CONFIG=/etc/vbox/autostartvm.cfg" | sudo tee /etc/default/virtualbox 

OUTPUT:

VBOXAUTOSTART_DB=/etc/vbox

VBOXAUTOSTART_CONFIG=/etc/vbox/autostartvm.cfg

sudo nano /etc/vbox/autostartvm.cfg 

default_policy = deny

citron = {
    allow = true
    startup_delay = 10
}

sudo usermod -aG vboxusers citron 
sudo chgrp vboxusers /etc/vbox 
sudo chmod g+w /etc/vbox 
sudo chmod +t /etc/vbox 

VBoxManage setproperty autostartdbpath /etc/vbox/ 
vboxmanage modifyvm centos_x64 --autostart-enabled on          
vboxmanage list vms

sudo systemctl restart vboxautostart-service

To disable

vboxmanage modifyvm fedora30 --autostart-enabled off

References:

https://kifarunix.com/autostart-virtualbox-vms-on-system-boot-on-linux/