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