libx11-xcb1-dbg software package provides Xlib/XCB interface library (debug package), 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-xcb1-dbg
libx11-xcb1-dbg is installed in your system.
Make ensure the libx11-xcb1-dbg package were installed using the commands given below,
$ sudo dpkg-query -l | grep libx11-xcb1-dbg *
You will get with libx11-xcb1-dbg package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Library development |
| Package | libx11-xcb1-dbg |
| Version | 2:1.6.2-1ubuntu2 |
| Description | Xlib/XCB interface library (debug package) |
| Sub Section | libdevel |