$ sudo apt-get remove kchmviewer 

Uninstall kchmviewer including dependent package

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

$ sudo apt-get remove --auto-remove kchmviewer 

Use Purging kchmviewer

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

$ sudo apt-get purge kchmviewer 

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 kchmviewer 

See Also,