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I have same problem - no java in firefox on kubuntu hardy
So, yeah, I'm in the same boat. That is, I get - install java messages, but under firefox preferences - content it shows java checked, and aboutlugins does not list java, but the Kubuntu package manager says I already have java runtime environment and plugin.
find the file called libjavaplugin_oji.so on your computer. This is the java plugin itself. For instance on my Slackware box it is at
Simply copy that plugin to your firefox plugins directory (/usr/lib/firefox/plugins for example). Make sure FF is closed when you do this.
If this doesn't fix it then try creating a symlink (use ln -s command) for the java plugin in the firefox plugins folder instead of a copy of the plugin.
I have fedora so i dont know if your ubuntu or kubuntu system would be the same setup but anyway you should get the point.
go to /usr/lib/mozilla/plugins and see if you have libjavaplugin.so .. if not then make a symbolic link and place the .so file in here..then try it again. BTW you should also see the flashplayer plugin here as well.
This is typical problem with Java plugins since Mozilla has been split into Firefox, Thunderbird and some other components. Sometimes plugins into directories named 'mozilla' (eg. /usr/lib/mozilla), while files should go in 'firefox' (eg. /usr/lib/firefox). Different distributions have different concepts for installations, making the whole issue even more confusing sometimes.
my xubuntu did not have java install and i had to have it to get netzero working. if you need to install java on ubuntu look at my netzero dialup post. it has a list of all the dependencies required and the order to install them in.
thanks - sorry I have not gotten back to report my results because I haven't had time to deal with it because of midterms. As soon as I can I plan to follow the suggestions given here and post those results. Just didn't want anyone to think their help was being taken for granted because I really appreciate everyone here!