I am not able to install PHPUnit or PHPUnit_Selenium in my ubuntu 14.04 lts system. I tried and followed all the steps listed in the link

https://wiki.phpmyadmin.net/pma/TestingEnvironment

as well as all other sources, after it failed. I also tried and updated the cache of channels. It seems to be some problem in the particular channel
pear.phpunit.de

but I couldn't understand it much. Any guidance is truly appreciated.

Thank you