virtualbox Ubuntu vboxuser Password is “changeme” and you have to update the /etc/sudoers file manually when doing Unattended Installation of Ubuntu is performed

you can’t use sudo until you do the following, but oddly you can simply “su -“/changeme to root from the vboxuser… screwballs, did it half-ass… in otherwords the root password is also “changeme” – I changed it

add this line immmediate following the root ALL=… line

vboxuser ALL=(ALL:ALL) ALL

Or simply check the box: Skip Unattended Installation, and you will have the option to setup your own privileged users…