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modprobe: ERROR: could not insert 'rtl8723de': Required key not available

I have been trying to install a driver for the RTL8723DE (aka RealTek d723) on a new HP laptop so that I can get wifi working. I am using the current version of Fedora 27 and "$ dnf update" says that I am up to date (March 24, 2018). A range of help pages give instructions for downloading a driver and installing the driver. Unfortunately, I get an error on the last step when using modprobe.

$ sudo modprobe -v rtl8723de ant_sel=2 insmod /lib/modules/4.15.10-300.fc27.x86_64/extra/rtlwifi.ko.xz modprobe: ERROR: could not insert 'rtl8723de': Required key not available

The Kernel module rtl8723de appears to be installed. The result from "$ lspci -k" shows that the kernel module is installed.

02:00.0 Network controller: Realtek Semiconductor Co., Ltd. Device d723 Subsystem: Hewlett-Packard Company Device 8319 Kernel modules: rtl8723de

I have rebooted the machine but it doesn't solver my problem. I am seeking help resolving the problem of why I cannot get the kernel driver to be used. Very thankful for any help.

For clarity purposes,

I installed dkms using "$ dnf install dkms"

I installed kernels using $ dnf install kernel-devel.x86_64$

I installed kernel headers using "$ dnf install kernel-headers.x86_64"

I installed the driver using the following commands from my "download folder":

$ git clone -b extended --single-branch https://github.com/lwfinger/rtlwifi_new.git unofficial

$ cd rtlwifi-new

$ sudo dkms add ../rtlwifi_new

$ sudo dkms build rtlwifi-new/0.6

$ sudo dkms install rtlwifi-new/0.6

The last command is "$sudo modprobe -v rtl8723de ant_sel=2" which does not work (please see beginning of message).