I am using a self-built JMC, and on Linux the default config tries to search for JVM at "../../bin", which makes default bundles fail on start:

$ curl https://builds.shipilev.net/jmc/jmc-latest-linux.tar.gz | tar xzf -
$ ./jmc
[Dialog box shows up: "A Java Runtime Environment (JRE) or Java Development Kit (JDK)
must be available in order to run Jmc. No Java virtual machine
was found after searching the following locations: ../../bin"]

Going to jmc.ini and removing these two lines:

"-vm 

../../bin"

...allows JMC to start with the default system JVM.