[NK3 mini] gpg: selecting card failed: No such device // GPG card setup

Nitrokeys FIDO2 / Nitrokey 3
7

Per default, gnupg uses its own CCID driver, not pcscd. If the card is detected by pcscd, gnupg can no longer access it. There are two solutions:

  1. Instruct GnuPG to use pcscd by adding disable-ccid to ~/.gnupg/scdaemon.conf and restart scdaemon with gpg-connect-agent 'SCD KILLSCD' /bye
  2. Stop pcscd and re-connect the device (make sure that pcscd is not activated again by a socket or similar)

See this guide for more information: Ludovic Rousseau's blog: GnuPG and PC/SC conflicts