Ubuntu 8.04 Hardy Heron has been giving me a good time lately except for the web browsing experience. Firefox 3 beta 5 is included in Ubuntu 8.04 final as the default web Browser even though its not stable. Above all, its not even compatible with Wordpress 2.5 and will keep bugging you now and then with new problems.
So whats the solution? Either get Opera for Linux or get back the old and mighty Firefox 2. Many users think that as Firefox 3 beta 5 has been included in the final release of Ubuntu 8.04 Hardy so probably there is no easy way to get rid of it and install Firefox 2 instead but in reality its very easy to do so.