OpenPGP Card The OpenPGP Card is an ISO/IEC 7816-4/-8 compatible smart card implementation that is integrated with many GnuPG functions. Using this smart card, various cryptographic tasks (encryption, ...

It could be some process has requested exclusive access to reader and/or smart card at USB level or PCSC level. Restarting pcscd in debug mode -d and maybe -a -f might show something. Reboot and as ...