@marcusquinn This can be done in linux and can be done with or without Cloudron. Lux can be enabled on any server you own running any modern linux flavor. You enable it during server install.
Essentially what I mean is - it cannot encrypt the drive completely after installing linux. While installing Ubuntu server, enable disk encryption via the disk menu, then install ubuntu as normal. Reboot, install cloudron - boom full disc encrytion.
If cloudron and ubuntu are already installed you can encrypt the home folder with lux but not the disk.
I was wandering was "lux" was, until I realized you probably meant Luks, right?