Install server on Debian testing Triexie

[nellePoint]

What script? 

Have you tried the official installation? 
https://jellyfin.org/docs/general/installation/linux

that official installation has a script, in that script

Code:

# Lists of supported architectures, Debian, and Ubuntu releases
SUPPORTED_ARCHITECTURES='@(amd64|armhf|arm64)'
SUPPORTED_DEBIAN_RELEASES='@(bullseye|bookworm|trixie)'
SUPPORTED_UBUNTU_RELEASES='@(focal|jammy|noble)'

note the

Code:

SUPPORTED_DEBIAN_RELEASES='@(bullseye|bookworm|trixie)''

i am also having this issue, looking through the repository, it definitely does not have any debian 13 (trixie) binaries, installing the debian12 binaries manually with dpkg can work, although it requires a lot of dependency hell