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[Mittles <1743139@xxxxxxxxxxxxxxxxxx>]

I have been able to replicate this bug. It becomes apparent when
attempting to run Minecraft.jar, the official Minecraft Java client
under OpenJDK 9 on a fresh install of Ubuntu Mate 18.04 Beta 2.
https://i.imgur.com/HRzRl8J.png

I was able to find a solution though it isn't a proper fix. Purge all
related packages and install the older openjdk-8-jre first, then an
newer version on top of it. It looks like the default packages are not
installing the certificates properly.

See https://askubuntu.com/questions/971059/17-10-openjdk-and-oracle-
jdk-8-and-9-the-trustanchors-parameter-must-be-non-empt under amb85.
Ubuntu MATE 18.04 includes a ppa in the Software Boutique which installs
Minecraft, but it runs into the same issue as using Minecraft.jar from
Mojang's website.

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which is subscribed to openjdk-9 in Ubuntu.
https://bugs.launchpad.net/bugs/1743139

Title:
  java.security.InvalidAlgorithmParameterException: the trustAnchors
  parameter must be non-empty

Status in openjdk-9 package in Ubuntu:
  Confirmed

Bug description:
  When trying to access anything using Java + HTTPS, the process is
  terminated with an java.security.InvalidAlgorithmParameterException.
  Adding -Djavax.net.ssl.trustStorePassword=changeit to the command line
  flags of java fixes this problem.

  Either the trust store's password should be changed, or this flag
  sould be added by default.

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