What do you mean that "requires your Root Password for install"? You mean at boot? Or you mean gnome-boxes is asking your root password? Never used gnome-boxes, but I have alpine installed in a VM on qemu-kvm, though I don't use a GUI but command line only and didn't have this issue. You should have qemu-system-x86_64 installed, so you could tryNewbee trying different distros on qemu gnome-Boxes using Mint os. Have tried a dozen operating systems and so far Alpine Linux is the only one that requires my Root Password for install. Why ?
$ cd /path/to/alpine.iso
qemu-system-x86_64 -machine q35 -cdrom alpine.iso -boot d -m 1024 -vga vmware -display gtk,gl=on -accel kvm
You mean this?I press 'Create' from iso gnome-boxes, machine starts boot until asking 'localhost login' then the 'password'. That's means asking for the Root. Other distros i tried have basically simply asked to create a user name and password.