dockerfile.run

xnlock

Heimdal Kerberos - X11 client programs

Debian

RUN apt-get update && \
    apt-get install -y heimdal-clients-x

Ubuntu

RUN apt-get update && \
    apt-get install -y heimdal-clients-x

Raspbian

RUN apt-get update && \
    apt-get install -y heimdal-clients-x

click the source code to copy install xnlock on any operating system with command-not-found.com