I have installed Jupiter on my Dell Inspiron 1520 with Ubuntu 10.04 but I am not able to choose the mode, I don't have the line "performance mode".
How can that be?
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Jupiter works fine with my Dell Latitude E6530 and Ubuntu 12.04.
Apparently Lucid (10.04) has only an older release of jupiter (0.0.53-2). The next versions of Ubuntu have an updated version 0.1.2-1. The first thing to do is to update your Jupiter version.
You may want to contact the webupd8 team and kindly ask them if they could provide an updated version for Lucid.
If they won't do that, you could try to install it from source but it seems a bit more difficult.