$ sudo apt-get remove isag 

Uninstall isag including dependent package

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

$ sudo apt-get remove --auto-remove isag 

Use Purging isag

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

$ sudo apt-get purge isag 

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 isag 

See Also,