How to uninstall or remove elpa-vala-mode software package from Ubuntu 16.10 (Yakkety Yak)

You can uninstall or removes an installed elpa-vala-mode package itself from Ubuntu 16.10 (Yakkety Yak) through the terminal,

$ sudo apt-get remove elpa-vala-mode

Uninstall elpa-vala-mode including dependent package

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

$ sudo apt-get remove --auto-remove elpa-vala-mode

Use Purging elpa-vala-mode

If you use with purge options to elpa-vala-mode package all the configuration and dependent packages will be removed.

$ sudo apt-get purge elpa-vala-mode

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 elpa-vala-mode