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I have installed gpg version 2.2.17 from source.

When I run gpg --card-status gpg reports: 

gpg: WARNING: server 'gpg-agent' is older than us (2.2.4 < 2.2.17).
gpg: Note: Outdated servers may lack important security fixes.
gpg: Note: Use the command "gpgconf --kill all" to restart them.

I have tried running the gpgconf command that was suggested but the problem persists. I have also tried uninstalling gpg2 from the Ubuntu repositories using sudo apt remove gpg2 and then rerunning gpgconf --kill all to no avail.

For good measure I even tried restarting my computer to kill the old version of gpg-agent.

Additionally, gpg-agent --version reports: 

gpg-agent (GnuPG) 2.2.17
libgcrypt 1.8.4
Copyright (C) 2019 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
DragonTamer
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    You may have multiple installations of `gpg-agent`? Does your system provide `gpg-agent` as a separate package that you have installed, or do you have older GnuPG versions installed? Where does `gpgconf` say the agent is living and is that the correct location? – Kusalananda Aug 22 '19 at 12:21
  • That was the problem. Thanks. – DragonTamer Aug 22 '19 at 12:28

1 Answers1

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Thanks to Kusalananda for helping me find my problem.

The issue was that gpg-agent was still installed through apt. Running sudo apt remove gpg-agent followed by gpgconf --kill all fixed the issue.

DragonTamer
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    In my case, only `gpgconf --kill all` solved the issue. My machine's uptime is 36 days and the GPG got updated during this time, which caused the warning. – Diogo Melo May 19 '20 at 16:24
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    @DiogoMelo, I keep forgetting and coming here to remember. Thanks! – Enlico Mar 08 '23 at 07:40