You can uninstall or removes an installed btrfs-modules-3.16.0-4-powerpc package itself from Debian 8 (Jessie) through the terminal,
$ sudo apt-get remove btrfs-modules-3.16.0-4-powerpc
If you would like to remove btrfs-modules-3.16.0-4-powerpc and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove btrfs-modules-3.16.0-4-powerpc
If you use with purge options to btrfs-modules-3.16.0-4-powerpc package all the configuration and dependent packages will be removed.
$ sudo apt-get purge btrfs-modules-3.16.0-4-powerpc
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 btrfs-modules-3.16.0-4-powerpc