You can uninstall or removes an installed qtcreator-plugin-remotelinux-d package itself from Ubuntu 14.04 LTS (Trusty Tahr) through the terminal,
$ sudo apt-get remove qtcreator-plugin-remotelinux-d
If you would like to remove qtcreator-plugin-remotelinux-d and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove qtcreator-plugin-remotelinux-d
If you use with purge options to qtcreator-plugin-remotelinux-d package all the configuration and dependent packages will be removed.
$ sudo apt-get purge qtcreator-plugin-remotelinux-d
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 qtcreator-plugin-remotelinux-d