I'm following the official guide to install Docker.

And in step 2 Add Docker’s official GPG key, I got the following error:

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
gpg: invalid key resource URL '/tmp/apt-key-gpghome.Rcg4Lpatvi/home:manuelschneid3r.asc.gpg'
gpg: keyblock resource '(null)': General error
gpg: key 1488EB46E192A257: 1 signature not checked due to a missing key
gpg: key 3B4FE6ACC0B21F32: 3 signatures not checked due to missing keys
gpg: key D94AA3F0EFE21092: 3 signatures not checked due to missing keys
gpg: key 871920D1991BC93C: 1 signature not checked due to a missing key
gpg: Total number processed: 9
gpg:       skipped new keys: 9

How do I solve that?

  • Just for context, I encountered the same issue and solved it by removing that manuelschneid3r key. And this key seems to be imported when I was trying to install the albert launcher. (albertlauncher.github.io/installing) I guess everyone here should be using albert as well. what a coincidence. Jun 25 at 21:50

I recently had the same issue and fixed it by doing

sudo rm "/etc/apt/trusted.gpg.d/home:manuelschneid3r.gpg"
  • I ran into this issue when trying to install podman(podman.io/getting-started/installation.html) onto ubuntu and this allowed me to get it installed.
    – Kuberchaun
    Sep 7 '20 at 8:24
  • How did you find out this?
    – Felipe
    Oct 19 '20 at 17:38
  • This worked for me as well. It was causing also zerotier-cli installation to fail due NO_PUBKEY 1657198823E52A61 error. Thanks a lot! Nov 13 '20 at 10:21
  • 2
    Pretty sure this results from installing the Albert launcher. I've opened up an issue for it there.
    – Sasgorilla
    Jun 24 at 15:27
  • 1
    In my case the command was slightly different: sudo rm "/etc/apt/trusted.gpg.d/home:manuelschneid3r.asc". Look in /etc/apt/trusted.gpg.d/ for the problematic key.
    – Sasgorilla
    Jun 24 at 15:32

Got this error while installing MongoDB. Following worked for me.

sudo rm /etc/apt/trusted.gpg.d/home:manuelschneid3r.gpg


I had the same issue. In my case, in the same directory /etc/apt/trusted.gpg.d I had .asc file just named differently. Once I renamed the .asc file by chaning its extension I was able to add Docker's gpg keys.

  • 1
    To be more precise, use this curl -fsSL https://download.docker.com/linux/ubuntu/gpg > /etc/apt/trusted.gpg.d/docker.asc
    – nagylzs
    Jul 10 '20 at 5:54

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