$ sudo apt-get remove kvm 

Uninstall kvm including dependent package

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

$ sudo apt-get remove --auto-remove kvm 

Use Purging kvm

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

$ sudo apt-get purge kvm 

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 kvm 

See Also,