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