You can uninstall or removes an installed debian-installer-8-netboot-arm package itself from Debian 9 (Stretch) through the terminal,
$ sudo apt-get remove debian-installer-8-netboot-arm
If you would like to remove debian-installer-8-netboot-arm and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove debian-installer-8-netboot-arm
If you use with purge options to debian-installer-8-netboot-arm package all the configuration and dependent packages will be removed.
$ sudo apt-get purge debian-installer-8-netboot-arm
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 debian-installer-8-netboot-arm
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