Tuesday, 30 April 2013

W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6AF0E1940624A220

It all started when i executed -
sudo apt-get update 
on my Ubuntu 12.04(Precise Pangolin). After fetching the required updates it showed me an error at the bottom - W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6AF0E1940624A220

Screen-shot for the same is given below -

Clearly we need to download the key from Ubuntu key server.

Things to check before you see Approach 1 and 2.
  1. Open the file ~/.gnupg/gpg.conf with the editor.
  2. From the terminal gedit ~/.gnupg/gpg.conf
  3. Go to 116th like
    keyserver hkp://keys.gnupg.net
  4. Comment this out and add line above it so the setup now looks like
    keyserver http://keyserver.ubuntu.com
    # keyserver hkp://keys.gnupg.net
    # keyserver mailto:pgp-public-keys@keys.nl.pgp.net
    # keyserver ldap://keyserver.pgp.com
  5. Save the file.

Trying Reset(Did not help. Same error persisted)

Enter the following command on the terminal - 
sudo rm /var/lib/apt/lists/* -vf
and then update your system using following command -  
sudo apt-get update && sudo apt-get upgrade

  • 1st Approach(Did not Work for me)

    Run the following command -
    sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6AF0E1940624A220This did not solve my problem. I got connection timed out.
    Generally Ubuntu key-server uses port 11371 which may be blocked by tour firewall. So you can use 80 as the port -
    sudo gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 6AF0E1940624A220

    But even this did not solve my problem -
    Errors i got by following both methods in this approach are in below screen-shot.


    Note :  Here if you are getting Connection refused then this may be a proxy problem. Check if you are behind any proxy or firewall.

  • 2nd Approach(Worked for me)

       If the command are not doing it for you, you have to do it on your own. After a long research on this problem i finally decided that the best thing to do was manually download the key and add it.This is how i did it.






    Go to Ubuntu Key-server(Click here). Here you can search your key. In my case it was 6AF0E1940624A220. Note while searching for key pre-append the key with 0x. So search for 0x6AF0E1940624A220


    Click on the link provided in the pub section.

    Copy the whole text(highlighted in below screen shot) from the page and save it in a file(say filename is key1).



Once you have copied the data to file. Save it. Then run the following command
sudo apt-key add key1

You will get an "OK" response.

aniket@aniket-Compaq-610:~/Desktop$ sudo apt-key add key1
[sudo] password for aniket:
OK

And you are done. Repeat the procedure of other keys that might be missing.
Then you can run
sudo apt-get update
and you will not get any error. Update happens smoothly. Do let me know if you still have any doubts.

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48 comments:

  1. Pratik Agrawal19 June 2013 at 12:58

    Thank you very much...worked so well..

    ReplyDelete
  2. Rasheed20 October 2013 at 18:16

    Thanks a lot. The second approached worked great.

    ReplyDelete
  3. Unknown4 November 2013 at 07:52

    Second approach worked for me. I have no clue why these small issues are necessary all the time. Anyway, you helped me a lot! Thanks dude!

    ReplyDelete
  4. maluba13 November 2013 at 22:57

    The second option worked pretty good and fast for me.

    Thanks a lot man

    ReplyDelete
  5. Iván Cruz23 December 2013 at 07:40

    Excellent it worked for me too, Thanks a lot

    ReplyDelete
  6. Unknown2 January 2014 at 23:02

    Great, the 2nd approach worked smoothly (ubuntu 12.04).

    ReplyDelete
  7. vikram3 January 2014 at 03:06

    Thank You !

    ReplyDelete
  8. moxin7 January 2014 at 23:33

    two thumbs high up

    ReplyDelete
  9. Brad31 January 2014 at 21:28

    Thanks Aniket
    Worked perfectly for me!

    ReplyDelete
  10. Aniket Thakur31 January 2014 at 21:43

    I know the feeling of getting stuck with this error. Glad it helped so many people!

    ReplyDelete
  11. Evergreen9 February 2014 at 07:32

    Sorry no the approaches work for me. I don't know how to do.

    https://drive.google.com/file/d/0B0WAJHUVk9sBbFhwVU9fNWNmSGs/edit?usp=sharing

    Could you help

    ReplyDelete
  12. Unknown3 March 2014 at 08:21

    Thanks a lot the second approach worked for me too.

    ReplyDelete
  13. Unknown19 April 2014 at 19:45

    Thank second tutotial work for me

    ReplyDelete
  14. Unknown13 May 2014 at 06:08

    Thanks for this valuable post; the first approach worked for me.

    ReplyDelete
  15. Venkatesh Jayapal15 May 2014 at 01:19

    Thanks.. First approach worked for me

    ReplyDelete
  16. mib16 September 2014 at 13:37

    It did not word for me... Neither the first or the second option; what can I do?

    ReplyDelete
  17. Knoxville4 October 2014 at 09:36

    neither worked for me either. after doing the second option I get Fetched 2,624 kB in 8s (303 kB/s)
    Reading package lists... Done
    root@Coldstone:~#

    can you help me figure out what I did wrong?

    ReplyDelete
  18. Aniket Thakur5 October 2014 at 08:00

    @mib could you give some more specific as in what difficulty or what part is not working ?

    @Knoxville Looking at the output it seems your public key not available error is not longer occurring and your packages are up to date. Am I missing something? If some broken packages are creating problem try "sudo apt get clean" and then update.

    ReplyDelete
  19. Knoxville8 October 2014 at 04:56

    no they arent updating, I've rebooted the server and tried again and after it reads the package list it does nothing but drop me back to the cursor. since 14.01 lts is available for ubuntuserver now thru apt I may just reinstall anyway if I cant get this fixed easily. its not doing anything critical as its my home server that I use to tinker with so its not that big of deal, just a big hassle.

    ReplyDelete
  20. Unknown5 March 2015 at 13:25

    Hi, I am getting following error :
    "W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY CBD000C02853C2C3"
    And the key that i am missing is unavailable on link given. - See more at: http://opensourceforgeeks.blogspot.in/2013/04/w-gpg-error-httpppalaunchpadnet-precise.html?showComment=1425590525730#c3487138071342912992

    ReplyDelete
  21. Unknown9 March 2015 at 10:30

    thanks! 2nd approach worked for me too on ubuntu 14.04

    ReplyDelete
  22. ilmaliil3 June 2015 at 01:20

    Thanks a lot!!! WORKED!!!

    ReplyDelete
  23. Unknown19 September 2015 at 12:19

    thanks it worked for me

    ReplyDelete
  24. Unknown19 November 2015 at 07:40

    Great!

    ReplyDelete
  25. Sandeep Manjanna8 December 2015 at 10:01

    Great. Thanks for this solution. Tried the second approach and it worked.

    ReplyDelete
  26. Unknown18 December 2015 at 22:36

    thanks a lot ...2nd approach worked for me. :D

    ReplyDelete
  27. andy21 December 2015 at 11:29

    And the second soultion worked!! Thanks!!

    ReplyDelete
  28. IOP Citizen12 January 2016 at 21:21

    Thanks Aniket!

    ReplyDelete
  29. Unknown15 January 2016 at 08:05

    Thanks for taking the time to post this. Second solution ftw!

    ReplyDelete
  30. Unknown9 February 2016 at 01:46

    Thanks, a ton man. Really worked for me!!!

    ReplyDelete
  31. Unknown26 February 2016 at 17:20

    Really nice!

    ReplyDelete
  32. Unknown1 March 2016 at 08:29

    when i save the file and run terminal sudo apt-key add key1
    no such file or directory ..... so what i should to do

    ReplyDelete
  33. Unknown4 March 2016 at 11:40

    Thanks!!

    ReplyDelete
  34. Unknown12 March 2016 at 05:34

    Modifying gpg.conf and resetting did not work for me either. However the first approach (getting the missing key) did work. I was missing a different key, though (4DF9B28CA252A784). Thanks for the help.

    ReplyDelete
  35. Precious Ulemu Bondwe18 March 2016 at 07:08

    Second option worked for me. Thanks a bunch

    ReplyDelete
  36. Unknown27 March 2016 at 21:37

    2nd approach worked !! Thanks a tonne !!

    ReplyDelete
  37. Unknown7 April 2016 at 08:29

    This was so helpful thank you!

    ReplyDelete
  38. kanakachary4 June 2016 at 05:56

    Thankyou so much... It helped me..

    ReplyDelete
  39. Diego18 June 2016 at 08:04

    thanks very much!!!

    ReplyDelete
  40. Unknown24 August 2016 at 05:51

    Thanks. The 2nd approach worked for me.

    ReplyDelete
  41. Pater A. Eko Budi Santoso, SJ19 September 2016 at 22:00

    Thank you. The 2nd approach work for me.

    ReplyDelete
  42. subrat sahoo27 February 2017 at 14:16

    thanks it worked for me .

    ReplyDelete
  43. Unknown5 June 2017 at 23:40

    i am not able get ok in both case

    after doing second approach

    i am getting as --- > krishna@ubuntu:~$ cd Desktop/
    krishna@ubuntu:~/Desktop$ touch key.txt
    krishna@ubuntu:~/Desktop$ vi key.txt
    krishna@ubuntu:~/Desktop$ ls
    key.txt
    krishna@ubuntu:~/Desktop$ sudo apt-key add key.txt
    [sudo] password for krishna:
    gpg: no valid OpenPGP data found.

    ReplyDelete
  44. Unknown18 June 2017 at 06:14

    GPG error: http://apt.osmc.tv jessie InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 553B25A766C762CC
    can u pls resolve this issue.

    ReplyDelete
  45. Slim Jim28 June 2017 at 14:58

    Thank you from 2017!

    ReplyDelete
  46. Unknown30 July 2017 at 20:48

    1. when sudo apt-get update, I've error like this,
    Fetched 316 B in 11s (27 B/s)
    Reading package lists... Done
    W: GPG error: http://ppa.launchpad.net precise Release: The following signatures were invalid: BADSIG 03396E1C3F7B4A1D Launchpad Misakovi
    2. Then, I've searched key in keyserver.ubuntu, copas it then saved it as Misakovi.
    azumah@azumah-Aspire-4310:$ sudo apt-key add Misakovi
    OK
    3. sudo apt-get update, but still result same error in step no. 1.
    4. I've also tried azumah@azumah-Aspire-4310:~$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 03396e1c3f7b4a1d
    Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.DWWiaeKsru --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver keyserver.ubuntu.com --recv-keys 03396e1c3f7b4a1d
    gpg: requesting key 3F7B4A1D from hkp server keyserver.ubuntu.com
    gpg: key 3F7B4A1D: "Launchpad Misakovi" not changed
    gpg: Total number processed: 1
    gpg: unchanged: 1

    5. sudo apt-get update result in same error still.

    Is anyone could do me a favour? Thanks.

    ReplyDelete
  47. Anonymous11 October 2017 at 14:18

    Worked for me. Thanks a lot :)

    ReplyDelete
  48. Unknown7 December 2017 at 04:53

    Second approach worked like a charm. Thank you so much!

    ReplyDelete

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