JNLP não abre

[pepejp]

Meus arquivo JNLP não abrem no ubuntu...

Não estou conseguindo abrir arquivos jnlp. Quando digito o comando javaws meeting.jnlp recebo a seguinte mensagem abaixo:

~/Downloads$ javaws meeting.jnlp
selected jre: /usr/lib/jvm/java-12-oracle
WARNING: package sun.applet not in java.desktop
WARNING: package javax.jnlp not in java.desktop
Warning - your JRE - 12 - does not match requested JRE - 1.6
Warning - your JRE - 12 - does not match requested JRE - 1.6
Warning - your JRE - 12 - does not match requested JRE - 1.6
Warning - your JRE - 12 - does not match requested JRE - 1.6
selected jre: /usr/lib/jvm/java-12-oracle
Unrecognized option: -Xincgc
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.