RtKit on my ubuntu?

Hi I just updated my ubuntu karmic Koala to Lucid Lynx and found sth strange on my file /etc/passwd.

rtkit:x:120:130:RealtimeKit,,,:/proc:/bin/false

Can someone tell me what it is?

Solution 1:

As the package description says, "Realtime Kit enables realtime scheduling for the PulseAudio daemon". This is an entry for the user running the RealtimeKit daemon.

Solution 2:

It's not actually a required package (only a recommended one):

$ aptitude why rtkit
i   pulseaudio Recommends rtkit

So you can remove it (though you may find you need if your pulseaudio app doesn't sound so good afterwards - but you can just reinstall it):

sudo apt-get remove rtkit