Running DMX on Linux

For a presentation I want to set up a demo instance of DMX on a Debian GNU/Linux 10 (buster) server (already running Jitsi / openjdk version “” 2020-11-04).

As described in the docs under “Installing Java”, I run the command sudo apt install openjdk-8-jre, but get:

package openjdk-8-jre is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:

E: Package ‘openjdk-8-jre’ has no installation candidate

How should I proceed?