If you would like to manually install this then you can follow these instructions.
- Update your packages with
sudo apt update - Upgrade your system with
sudo apt upgrade -y - Install the following dependencies:
sudo apt install exfat-fuse exfat-utils perl libnet-ssleay-perl openssl libauthen-pam-perl libpam-runtime libio-pty-perl apt-show-versions python - Download and install Webmin with:
wget https://prdownloads.sourceforge.net/webadmin/webmin_1.930_all.deb && sudo dpkg --install webmin_1.930_all.deb - Create the external hard drive's mount directory with
sudo mkdir /mnt/drive - Mount your hard drive to the mount directory with
sudo mount /dev/sda2 /mnt/drive - Reboot your pi with
sudo reboot
Note: This is everything the Installer Script does but just faster.