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I had install Ubuntu 11.04 on two PC. On one everything work perfect, but another after some time turn off computer. I tried a lot of ideas(reinstall, openJDK 7(give just black screen), but all still as it was before. I hope on your help! Please! About PC(i don't remember all): AMD 5500; Nvidia (maybe) Zotac GT 450(512M) ram 2 GB And one more ask will instalation Sun JDK steal the trobel's?

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Minecraft is not supported by openJDK. (I have learned this the hard way.) You need (well not need, but I haven't seen a running minecraft in openJDK yet) to install sun java, of which there are a myriad of ways (all of them buggy, none of them official) to install it correctly.

A fix for this issue might be an upgrade to 12.04 . It is an LTS, and is a lot less buggy then 11.04 (The first implementation of unity in ubuntu). A lot more stable, less buggy, etc. Other than that, there isn't a lot anyone can do to help.

See this website on a guide to installing sun java jdk 6-7 in ubuntu 12.04. I think either will work, and I also think that this should apply to 11.04. Alternatively, see this question for java jdk 6, this question for java jdk 7, and this quesiton for java jre 7. I would recommend a jdk of either version.

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I run minecraft servers and minecraft itself off of Ubuntu. It does work, but you need to install Sun Java. Saying "It's not supported" is a lie, it just takes some work to get it to run. Also, asking questions to the user here seems to be all you're doing, other than spurting incorrect information. 11.04 is indeed still supported, and upgrading from Natty to Precise isnt as easy (you'd need to upgrade to Oneiric first and then to Precise, and stuff breaks more often then) –  Thomas W. Jul 24 '12 at 13:03
    
@LordofTime That is what I am saying: Minecraft does not run under OpenJDK, so you need sun java. Also, upgrading is just a suggestion, and I can't really help this guy much since he hasn't given a lot of information. –  JXPheonix Jul 24 '12 at 13:16
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"but minecraft for ubuntu is not supported and should be avoided." <-- that statement is not a valid statement, i am quoting your answer. that there is why i commented. it is supported if you install the additional software. Saying its not supported is like me saying "Oh, Ubuntu isnt supported on Macs" even though it is with some work. –  Thomas W. Jul 24 '12 at 13:24
    
why would you install the jdk to play minecraft?! your answer is just worng in so many places. remove it please. –  Alvar Jul 24 '12 at 14:39
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