I found that now FSLView is available in Ubuntu 12.04
Below is the screenshot I installed in Lin4Neuro.
Now I do not have any hesitation moving from Ubuntu 10.04 to Ubuntu 12.04 (Actually Xubuntu 12.04)
So from now on I will stop developing Lin4Neuro based on Ubuntu 10.04. I keep working on getting Lin4Neuro based on Xubuntu 12.04 better and better.