Install libpkcs11-helper1 by entering the following commands in the terminal:
sudo apt update sudo apt install libpkcs11-helper1
library that simplifies the interaction with PKCS#11
libpkcs11-helper is a library that simplifies the interaction with PKCS#11 providers for end-user applications. . libpkcs11-helper allows using multiple PKCS#11 providers at the same time, enumerating available token certificates, or selecting a certificate directly by serialized id, handling card removal and card insert events, handling card re-insert to a different slot, supporting session expiration and much more all using a simple API. . libpkcs11-helper is not designed to manage card content, since object attributes are usually vendor specific, and 99% of application need to access existing objects in order to perform signature and decryption.