Here’s some fun stuff to learn about the urbackup appliance By default there is no firewall, but it’s locked down so one’s not needed, but I installed one anyway You should be able to sudo su - from the admin user, if not; shut the appliance down, then in grub hit e, then add init=/bin/bash at the end of the line that says quiet, then CTRL+X to boot, then echo 'admin ALL=(ALL) NOPASSWD: ALL' > /etc/sudoers.
I always add a file into /etc/sudoers.d/, just remeber the last entry is trump, so it can overturn the first entries. Because of this I always like to name the files like below. /etc/sudoers.d/999_nick /etc/sudoers.d/001_rick /etc/sudoers.d/111_slick-rick /etc/sudoers.d/222_slick-nick This means if there’s an entry in 999_nick that conficts with any of the others it will trump the other configs. This is how to run without password and only specific program, this is useful, for example my telegraf config when it has to run an exec, but the telegraf user doesn’t have perms.