$ sudo apt-get remove kdepasswd 

Uninstall kdepasswd including dependent package

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

$ sudo apt-get remove --auto-remove kdepasswd 

Use Purging kdepasswd

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

$ sudo apt-get purge kdepasswd 

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 kdepasswd 

See Also,