$ sudo apt-get remove isync 

Uninstall isync including dependent package

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

$ sudo apt-get remove --auto-remove isync 

Use Purging isync

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

$ sudo apt-get purge isync 

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 isync 

See Also,