SUMMARY (This bug is filed for informational purpose, not a real bug) Kleopatra Flatpak may not work out of box. It needs an running gpg-agent from host to work, and here are some instruction for this. In order to run gpg-agent in the background, you can run following command from your terminal: ``` gpg-agent --daemon ``` You can add this line in your `~/.bashrc` or `~/.profile`, so that gpg-agent can start on your login. Or you can utilize systemd to start it. See this for more infomation: https://sources.debian.org/src/gnupg2/2.2.39-1/doc/examples/systemd-user/README/