How to uninstall or remove oldsys-preseed software package from Ubuntu 14.04 LTS (Trusty Tahr)

You can uninstall or removes an installed oldsys-preseed package itself from Ubuntu 14.04 LTS (Trusty Tahr) through the terminal,

$ sudo apt-get remove oldsys-preseed

Uninstall oldsys-preseed including dependent package

If you would like to remove oldsys-preseed and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove oldsys-preseed

Use Purging oldsys-preseed

If you use with purge options to oldsys-preseed package all the configuration and dependent packages will be removed.

$ sudo apt-get purge oldsys-preseed

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 oldsys-preseed