I am using Lubuntu 13.04 and after install of the OS I had installed Sun Java from the Oracle website. I followed the instructions given on https://sites.google.com/site/easylinuxtipsproject/java . I think , I had made Oracle Java as default. And for many days it worked just fine. Now , since it is not installed via repositories , it doesn't get updated. And whenever the applets would say Update Plug-in I would ignore the warning and run the old plug-in . This worked for a month or so. But recently the applets didn't load at all , they were taking eternity. So I decided to shift to Iced-Tea , Open JDK and that sort of stuff. I even made Open JDK as the default version , but the problem is not going. And I fear I have now executed some steps which I don't completely understand - I uninstalled Open JDK 7 and switched to Open JDK 6 . And the situation is unchanged. Is is possible that you ask me to give the output of some commands in the terminal , using which you may be able to diagnose the problem my system has ?
(I didn't mark Lubuntu as prefix because I don't think it is an issue arising due to Lubuntu as such.)