libpth20 software package provides GNU Portable Threads, 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 libpth20
libpth20 is installed in your system.
Make ensure the libpth20 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libpth20 *
You will get with libpth20 package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Libraries |
| Package | libpth20 |
| Version | 2.0.7-19ubuntu1 |
| Description | GNU Portable Threads |
| Sub Section | libs |