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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?

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    apt-cache search RealtimeKit could have helped you track what it is about... Jan 29, 2018 at 22:55

2 Answers 2

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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.

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    ehhh... #WipeSweatFromHead I read "Root Kit" Jan 16, 2017 at 15:46
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    Aw, yes. What an unfortunate name, also rtkit-daemon...
    – isync
    Jan 9, 2018 at 18:44
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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

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