You can uninstall or removes an installed pari-gp2c package itself from Ubuntu 14.04 LTS (Trusty Tahr) through the terminal,
$ sudo apt-get remove pari-gp2c
If you would like to remove pari-gp2c and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove pari-gp2c
If you use with purge options to pari-gp2c package all the configuration and dependent packages will be removed.
$ sudo apt-get purge pari-gp2c
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove pari-gp2c
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