Install ruby-lockfile by entering the following commands in the terminal:
sudo apt update sudo apt install ruby-lockfile
Description:
create NFS-safe lockfiles
This is a Ruby library for creating lockfiles safe for use over NFS (Network File System). . The package contains both the library for including lockfile in Ruby programs and the command line program rlock. The program rlock can either create lockfiles or optionally can run a program with a lockfile.
Homepage: http://codeforpeople.com/lib/ruby/lockfile/
Version: 2.1.3-1
Section: universe/devel