You can uninstall or removes an installed libc-icap-mod-virus-scan package itself from Ubuntu 14.04 LTS (Trusty Tahr) through the terminal,
$ sudo apt-get remove libc-icap-mod-virus-scan
If you would like to remove libc-icap-mod-virus-scan and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove libc-icap-mod-virus-scan
If you use with purge options to libc-icap-mod-virus-scan package all the configuration and dependent packages will be removed.
$ sudo apt-get purge libc-icap-mod-virus-scan
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 libc-icap-mod-virus-scan