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I cannot seem to open Minecraft.jar from the file browser. Everytime I try, I select open with, then Sun Java and nothing happens. I've tried the terminal too, but that fails and just reports a load of errors. Can somebody help me?

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Please post the errors. Are you sure you have java? –  Jacob Johan Edwards Apr 27 '12 at 14:45
What's your output when you do sudo java -version? –  cloyd800 Apr 27 '12 at 15:10
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3 Answers 3

go to the folder with the .jar file.

type: java -jar filename.jar in the terminal

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update-java-alternatives -l

to see, what Java versions are installed. Often there is more than one.

update-java-alternatives -h 

to get more help, specify your prefered version with

update-java-alternatives -s VERSION_NAME
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You should install java run time and you can run with micro emulator. You can consult the following post: http://callthetricks.com/3375/jar-file-ubuntu/

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