Unable to use sudo apt-get update: "NO_PUBKEY 26EB39123AAAAA96"

Question

Every time I try to run apt-get update, I get the message below:

W: GPG error: http://as-repository.openvpn.net/as/debian focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 26EB39123AAAAA96

I'm quite new to Ubuntu, and Linux/Terminal in general, so despite as much as I've looked around and tried solutions, I can't seem to solve it.

I've tried sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 26EB39123AAAAA96 which results in:

Executing: /tmp/apt-key-gpghome.U6CXBaZaHQ/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys 26EB39123AAAAA96
gpg: keyserver receive failed: No data

I also tried sudo apt-key update, which resulted in this:

Warning: 'apt-key update' is deprecated and should not be used anymore!
gpg: key 3B4FE6ACC0B21F32: 3 signatures not checked due to missing keys
gpg: key 3B4FE6ACC0B21F32: "Ubuntu Archive Automatic Signing Key (2012) <ftpmaster@ubuntu.com>" not changed
gpg: key D94AA3F0EFE21092: 3 signatures not checked due to missing keys
gpg: key D94AA3F0EFE21092: "Ubuntu CD Image Automatic Signing Key (2012) <cdimage@ubuntu.com>" not changed
gpg: key 871920D1991BC93C: 1 signature not checked due to a missing key
gpg: key 871920D1991BC93C: "Ubuntu Archive Automatic Signing Key (2018) <ftpmaster@ubuntu.com>" not changed
gpg: Total number processed: 3
gpg:              unchanged: 3

I'm at an absolute loss here. I use this machine regularly, and can't update some of my packages, which is causing a couple of programs to not work. Any help would be greatly appreciated. I can also provide any other necessary info.

Welcome to Ask Ubuntu. Can you tell is the application package or the repository this public key is related to? Please edit your question with the new information. — user68186, Dec 07 '20 at 01:36
The sudo apt update error should tell you which repository can't be accessed because of this key. — user68186, Dec 07 '20 at 21:40
I see W: GPG error: http://as-repository.openvpn.net/as/debian focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 26EB39123AAAAA96, is that it? If that's the case, I'm at a loss, because I uninstalled OpenVPN — calebmartin2477, Dec 07 '20 at 22:50
Please edit your question and add the above information in your question. This will help others understand your problem better. — user68186, Dec 07 '20 at 22:52
This means the problem is with the repository website as-repository.openvpn.net. This is not a standard Ubuntu repository. It is possible they changed their private-public key pair recently. — user68186, Dec 07 '20 at 22:58
Ah. Is there any way to just remove the entirety of OpenVPN then? I thought I already did, apparently I failed — calebmartin2477, Dec 07 '20 at 23:16
Can you just remove the offending repo? I don't know how you added it, but it should be somewhere in /etc/apt, probably in /etc/apt/sources.list.d/ — Organic Marble, Dec 07 '20 at 23:28

score 3 · Answer 1 · answered Feb 05 '21 at 18:56

3

found that this works

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 40976EAF437D05B5
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32

Thanks to https:// www.osmage.com/no-signature-ubuntu/

answered Feb 05 '21 at 18:56

LateAgain

39

score -1 · Answer 2 · answered Dec 07 '20 at 01:53

Looks like the keys are still valid, so you should be able to get them imported with the following: gpg --keyserver hkp://keys.gnupg.net --recv-keys {key}

Here is what I get for each of them:

$ gpg --keyserver hkp://keys.gnupg.net --recv-keys 3B4FE6ACC0B21F32
gpg: key 3B4FE6ACC0B21F32: public key "Ubuntu Archive Automatic Signing Key (2012) <ftpmaster@ubuntu.com>" imported
gpg: Total number processed: 1
gpg:               imported: 1
$ gpg --keyserver hkp://keys.gnupg.net --recv-keys D94AA3F0EFE21092
gpg: key D94AA3F0EFE21092: public key "Ubuntu CD Image Automatic Signing Key (2012) <cdimage@ubuntu.com>" imported
gpg: Total number processed: 1
gpg:               imported: 1
$ gpg --keyserver hkp://keys.gnupg.net --recv-keys 871920D1991BC93C
gpg: key 871920D1991BC93C: public key "Ubuntu Archive Automatic Signing Key (2018) <ftpmaster@ubuntu.com>" imported
gpg: Total number processed: 1
gpg:               imported: 1

From here, you can sudo apt-get update and everything should work.

Hope this helps

Just gave that a try, getting "gpg: keyserver receive failed: No data" — calebmartin2477, Dec 07 '20 at 02:42
Perhaps a different key server would work. Try hkp://keyserver.ubuntu.com instead: gpg —keyserver hkp://keyserver.ubuntu.com --recv-keys {key} — , Dec 07 '20 at 02:55
Still getting gpg: keyserver receive failed: No data. Bizarre. — calebmartin2477, Dec 07 '20 at 21:05

Unable to use sudo apt-get update: "NO_PUBKEY 26EB39123AAAAA96"

2 Answers2