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Hi i got this error while running the sudo apt-get update command on my Ubuntu machine :(

Error:

Fetched 308B in 1s (158B/s)
Reading package lists... Done
W: GPG error: http://ppa.launchpad.net intrepid Release: 
  The following signatures couldn't be verified because the public key
  is not available: NO_PUBKEY 5A9BF3BB4E5E17B5
W: You may want to run apt-get update to correct these problems
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migrated from stackoverflow.com Oct 31 '09 at 12:05

This question came from our site for professional and enthusiast programmers.

    
This really does belong on superuser, even though you are getting stuck after adding a launchpad PPA. –  Tim Post Oct 31 '09 at 11:52
    
yes. how can i solve this. ? –  tutorboy.com Oct 31 '09 at 11:59
    
Wait for it to be migrated to superuser and you'll get plenty of help. –  Tim Post Oct 31 '09 at 12:01
    
Given ~unutbu's answer I doubt it will help, but: did you try to run apt-get update to correct these problems? –  Arjan Oct 31 '09 at 13:12

2 Answers 2

You need to download the gpg key:

gpg --keyserver keyserver.ubuntu.com --recv 4E5E17B5
gpg --export --armor 4E5E17B5 | sudo apt-key add -

See http://ubuntuforums.org/showthread.php?p=6626085#post6626085

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===gpg: keyserver timed out gpg: keyserver receive failed: keyserver error===== getting error :( –  tutorboy.com Oct 31 '09 at 12:03
1  
The keyserver might be down. You may have to wait and try again later. See also ubuntuforums.org/showthread.php?t=1221323 for sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 5A9BF3BB4E5E17B5 which should also fix the problem once the keyserver is working. –  unutbu Oct 31 '09 at 12:21

In ubuntu 9.10, if repositories are added using the command add-apt-repository, the keys are automatically imported. This way, you don't get this error/warning.

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