Check out proxmox. Debian base with Debian apt repos available for standard stuff, with ZFS built into their kernels. Easy to install. And, if you insist on running TrueNAS (or whatever) just stash it in a container or KVM box.
(Edited to add: I forgot! ZFS on root available from the installer -- encrypted even if that's your jam.)
(Edited to add: I forgot! ZFS on root available from the installer -- encrypted even if that's your jam.)