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I tried to install some third party packages by following instructions on this URL.

After doing the following, I started to get the error "Unable to locate the package"

root@ubuntu:/# cd /root/
root@ubuntu:~# wget
root@ubuntu:~# apt-key add jcameron-key.asc

After googling I found if I deleted the sources.list file it will be recreated, which I did. But whenever I try to install anything it gives the error "Unable to locate package". I tried generating the source.list file and pasting the content it seems to work but, when I go the following.

sudo apt-get update

it gives me this error.

W: GPG error: precise-updates/grizzly Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5EDB1B62EC4926EA

How can I solve this, I have been googling for days now, can't just re-install my server. Thanks.

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up vote 1 down vote accepted

You really don't need to reinstall your server because of this. This is just a problem with handling the keys that sign the repositories' contents. You need to read the apt-key(8) and gpg manpages.

Try this procedure:

  • look for the public key hinted in the error message.

    # gpg --recv-keys 5EDB1B62EC4926EA
    gpg: requesting key EC4926EA from hkp server
    gpg: key EC4926EA: public key "Canonical Cloud Archive Signing Key <>" imported
    gpg: Total number processed: 1
    gpg:               imported: 1  (RSA: 1)
  • once the key has been downloaded, export it to a file.

    # gpg --export EC4926EA > canonical.asc
  • now you can add it to the APT keyring.

    # apt-key add canonical.asc
  • update the indices by issuing:

    # aptitude update
  • now there should be no problem listing packages from that repository, provided you have it properly configured in your sources.list.

    # aptitude search $package
share|improve this answer
Thank you very much for the response. I get this result. gpg: WARNING: unsafe ownership on configuration file `/home/himsadmin/.gnupg/gpg.conf' gpg: external program calls are disabled due to unsafe options file permissions gpg: keyserver communications error: general error gpg: keyserver receive failed: general error – JRulz Oct 10 '13 at 10:55
That error message means exactly that: review the ownership and permissions of your gpg.conf, it should belong to you, your group and don't be group or others readable or writable. – dawud Oct 10 '13 at 10:58
Thank you very much, everything works perfectly now. Your answers were specific, clear and timely. – JRulz Oct 11 '13 at 5:41

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