libx11-protocol-perl software package provides Perl module for the X Window System Protocol, version 11, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libx11-protocol-perl
libx11-protocol-perl is installed in your system.
Make ensure the libx11-protocol-perl package were installed using the commands given below,
$ sudo dpkg-query -l | grep libx11-protocol-perl *
You will get with libx11-protocol-perl package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Perl |
| Package | libx11-protocol-perl |
| Version | 0.56-4 |
| Description | Perl module for the X Window System Protocol, version 11 |
| Sub Section | Perl |