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I have Ubuntu 12.10 for x86-64 on my PC and I'm trying to run a .jnlp file. I've installed Java 7 and the Java plugin for Mozilla Firefox manually (Because there is no .deb package for Java 7 for Ubuntu). Whenever I double click a .jnlp file, firefox is opened and it gives me the option of opening the file with firefox or saving it, if I click save it download the file I'm trying to run and if I click open with firefox web browser it opens another tab and asks me again (in the new tab) to either open or save. I used to run the exact same file on Debian, so what should I do to run this file on Ubuntu?

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Have you tried verifying that java is working properly? You can use this link to see if it is. http://www.java.com/en/download/installed.jsp?detect=jre If not, You'll have to get it enabled properly. I'm still a bit of a Noob but I had that same problem. Regards

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Yes, and it's verified just fine –  Sameh Hany Feb 22 '13 at 16:15
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First install the icedtea-7-plugin package that include the java browser-plugin and the javaws webstart tool that can launch .jnlp files.

Use javaws to open the downloaded .jnlp file.

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