You can uninstall or removes an installed apache-icons package itself from Debian 9 (Stretch) through the terminal,
$ sudo apt-get remove apache-icons
If you would like to remove apache-icons and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove apache-icons
If you use with purge options to apache-icons package all the configuration and dependent packages will be removed.
$ sudo apt-get purge apache-icons
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 apache-icons
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