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How to fix NO_PUBKEY errors in "apt-get update" operations

2007, May 25 - 12:23 — müzso
You can find the answer in this post, but I also document it here so I'll have a permanent copy.

Let's suppose you've got an error like this:
W: GPG error: http://ftp.de.debian.org stable/non-US Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F1D53D8C4F368D5D
W: You may want to run apt-get update to correct these problems

You should run the following to fix it (substitute F1D53D8C4F368D5D with the one from your error message):
gpg --keyserver subkeys.pgp.net --recv F1D53D8C4F368D5D
gpg --export --armor F1D53D8C4F368D5D | apt-key add -

Now you can run apt-get update and will not get an error message.

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2007, June 4 - 09:41 — EL0HIM (not verified)

sudo gpg --keyserver


sudo gpg --keyserver subkeys.pgp.net --recv F1D53D8C4F368D5D
gpg: requesting key 4F368D5D from hkp server subkeys.pgp.net
gpg: key 4F368D5D: public key "Debian Archive Automatic Signing Key (2005) <ftpmaster@debian.org>" imported
gpg: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model
gpg: depth: 0  valid:   1  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 1u
gpg: Total number processed: 1
gpg:               imported: 1


sudo gpg --export --armor F1D53D8C4F368D5D | apt-key add -
gpg: can't open `/etc/apt/trusted.gpg'
gpg: keydb_get_keyblock failed: eof
gpg: no writable keyring found: eof
gpg: error reading `-': general error
gpg: import from `-' failed: general error


So don't work Sad

2007, June 4 - 11:00 — müzso

are keyrings installed?

Check whether you've the appropriate keyring package installed.
On Debian it's the debian-archive-keyring package, on Ubuntu it's the ubuntu-keyring package. If you've the keyring package installed, then try to update the keys with an apt-key update first and try to add the missing key (as described in my original post) only afterwards.

2007, June 27 - 00:54 — Michael Brown (not verified)

sudo doesnt carry across the

sudo doesnt carry across the pipe. You need to:

sudo gpg --export --armor F1D53D8C4F368D5D | sudo apt-key add -

Note the second 'sudo'

2007, June 27 - 14:13 — müzso

Re: sudo doesnt ...

Thanks. I didn't notice that one in example by EL0HIM. I used to start a root shell with sudo since it makes life a lot easier if you've to execute several commands in a row with root privileges.

2009, May 29 - 04:23 — chevre (not verified)

sudo

normaly ur message means that u have a lock on ur file for this user and if u use the solution with sudo u ll have pb too there is user usage pb so what u realy need to do is drop the first sudo and just use sudo on the second i think that ur user dont have access to apt-get so u must use :
gpg --armor --export KEY_NUMBER | sudo apt-key add -

2011, August 14 - 07:15 — mkultra329 (not verified)

solved the problem for me!

This is one of the few sites where this solution is specified, and it worked for me. Thanks!

2009, May 28 - 08:39 — rduke15 (not verified)

You may need to try different key servers

Had the problem with key 9AA38DCD55BE302B, but subkeys.pgp.net or keyring.debian.org didn't have the key. Eventually, it worked with wwwkeys.eu.pgp.net :

gpg --keyserver wwwkeys.eu.pgp.net --recv 9AA38DCD55BE302B
gpg --export --armor 9AA38DCD55BE302B | apt-key add -

2009, August 5 - 23:14 — Anonymous (not verified)

Worked fine! Thank you very

Worked fine! Thank you very much Smiling

2009, September 16 - 09:21 — Ed B (not verified)

Many many thanks

Am just starting a server upgrade and had this problem. Many thanks to the original poster and especially to you for this note on the necessary lines!

Gotta love the internet!

2009, September 17 - 20:07 — Nik (not verified)

Thanks

This worked for me too. Great!

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