Public bug reported:

After installing jmodeltest via apt, it simply fails to run.
This happens in both Ubuntu and Xubuntu 20.04
How to reproduce:

```
sudo apt install jmodeltest
jmodeltest
```

Expected:
jmodeltest should launch

What happens:
jmodeltest fails tostrart with the message:

/usr/bin/jmodeltest:9 : Can't open /usr/lib/java-wrappers.sh

Install the package "java-wrappers", works around the issue, but
jmodeltest still fails to run, now with the following error:

```
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: 
mpi/MPIException has been compiled by a more recent version of the Java Runtime 
(class file version 55.0), this version of the Java Runtime only recognizes 
class file versions up to 52.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:757)
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:473)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:419)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:352)
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
        at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
        at java.lang.Class.getMethod0(Class.java:3018)
        at java.lang.Class.getMethod(Class.java:1784)
        at 
sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:650)
        at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:632)
```

I was unable to work around this error, and had to resort to the binary
distributed in github. =-(

** Affects: jmodeltest (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: java

** Tags added: java

-- 
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https://bugs.launchpad.net/bugs/1967774

Title:
  jmodeltest fails to start with the error: /usr/bin/jmodeltest:9 :
  Can't open /usr/lib/java-wrappers.sh

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