So you have Proxmox. Then you have a Debian LXC that you installed Jellyfin to with the debuntu install script? Within this Debian LXC you copied and pasted /var/lib/jellyfin and /etc/jellyfin?
Jellyfin 10.10.3 (Docker)
Ubuntu 24.04 LTS
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
3x WD Red Pro 6TB CMR in RAIDZ1 (JF Library)