I installed Eclipse, updated it and then installed PyDev plug-in. Now the Preferences window contains only 5 basic tabs. There's no Pydev's, Ant's etc. settings. PyDev's settings did not appear after it was reinstalled. I'm using Ubuntu Server 12.04. Looking forward for some advice except reinstalling Eclipse
How did you install Eclipse? If from Ubuntu repository, then you should uninstall, go to eclipse.org select the Download link, download a zip file for your preferred package, unzip it to a directory on your system.