Install libsasl2-modules-gssapi-heimdal by entering the following commands in the terminal:
sudo apt update sudo apt install libsasl2-modules-gssapi-heimdal
Description:
Pluggable Authentication Modules for SASL (GSSAPI)
This is the Cyrus SASL API implementation, version 2.1. See package libsasl2-2 and RFC 2222 for more information. . This package provides the GSSAPI plugin, compiled with the Heimdal Kerberos 5 library.
Homepage: https://www.cyrusimap.org/
Version: 2.1.27~101-g0780600+dfsg-3ubuntu2
Section: universe/libs