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Troubleshooting:[http://askubuntu.com/questions/377476/minecraft-running-slow Minecraft running slow] - ''my linux minecraft was running on 12 to 14 fps. i have installed hava 7,java 8, openjdk 7 and everything requires but minecraft stil slow''This command should tell you what is currently providing the Java virtual machine (java) and the Java compiler (javac):file /etc/alternatives/java /etc/alternatives/javacThis assumes the "alternatives" system is working properly, which might not be the case, depending on how Java has been "messed up" in the past. To check this, run:file `which java javac`If the alternatives system is working correctly and being used by Java, then you should see:/usr/bin/java: symbolic link to `/etc/alternatives/java'/usr/bin/javac: symbolic link to `/etc/alternatives/javac'=== Troubleshooting ======= low fps ====[http://askubuntu.com/questions/377476/minecraft-running-slow Minecraft running slow] - ''my linux minecraft was running on 12 to 14 fps. i have installed hava 7,java 8, openjdk 7 and everything requires but minecraft stil slow''This command should tell you what is currently providing the Java virtual machine (java) and the Java compiler (javac):file /etc/alternatives/java /etc/alternatives/javacThis assumes the "alternatives" system is working properly, which might not be the case, depending on how Java has been "messed up" in the past. To check this, run:file `which java javac`If the alternatives system is working correctly and being used by Java, then you should see:/usr/bin/java: symbolic link to `/etc/alternatives/java'/usr/bin/javac: symbolic link to `/etc/alternatives/javac'==== Fullscreen (F11) fails to redraw Minecraft window contents ====Reported as a bug here: https://bugs.mojang.com/browse/MC-46669Similar to this: https://bugs.mojang.com/browse/MC-69793Only known fix: Keep pressing F11. Just keep pressing it. After 5 - 20 times it will eventually display. Don't press to fast.