Reboot your workstation, enter your UEFI firmware, set the USB device to boot before the hard disk, save your changes, leave the firmware and boot in the live USB selecting the “Try Ubuntu…
there is no way to encrypt a mounted partition in Linux and you cannot unmount the root partition from which you have booted, so you will have to boot from a live USB
https://www.ovh.com/manager/#/dedicated/vps/vps713872.ovh.net/dashboard does not seem to help switching to UEFI.
DuckDuckGo search OVH Boot UEFI.
DuckDuckGo search Linux check if booted with UEFI.
I doubt that it means UEFI being supported but let us try anyway.
Ubuntu 18.04 and above offers to encrypt your hard disk in automated fashion during its installation using dm-crypt and LUKS [1]. However, this option forces you to wipe your entire disk, which…
https://johndoe31415.github.io/luksipc/testing.html may be interesting but does not manage root partition case.
I quickly have read johndoe31415/luksipc/issues/{13,[12](https://github.com/johndoe31415/luksi…
DuckDuckGo search Ubuntu full disk encryption after install.
Maybe can somehow access raw ext4 in encrypted container, then just copy with dd. Just copying files and folders from / does not seem very correct to me, but may be.