Upgrade from 2.5 - Java not installing

Hello I try to install OH3 on openhabian openHAB 2.5.12 (Release Build), but system is unable to upgrade to java 11.

2023-02-20_18:53:28_CET [openHABian] WARNING: We were unable to detect Java 11 on your system so we will install the openHABian default (OpenJDK 11).2023-02-20_18:53:29_CET [openHABian] Fetching OpenJDK 11… FAILED

2023-02-20_18:53:33_CET [openHABian] Installing OpenJDK 11… FAILED

Thanks for any help.

Which debian release is running on your host stretch, buster, bullseye ?

cat /etc/os-release

I assume it is stretch - which is tooooooo old.

Thank you - yes it is stretch - so I have to clean install it.