Ubuntu 20.04: I cannot compile latest ndiswrapper [duplicate]

You may use the driver hosted at Larry Finger's rtlwifi_new git repository. You would have to disable secure boot from the the BIOS/EFI first. Also make sure you have linux-headers for the respective kernel(s) and build-essential package installed. Then follow the steps below (you need to be connected to the internet by some other mean).

1. Install git and dkms if they're not installed by running

   sudo apt install git dkms
   

2. Clone the repository

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

3. Run the following commands to install

   sudo dkms add rtlwifi_new
   sudo dkms install rtlwifi-new/0.6
   

4. Reboot.

This should also work with newer kernels (and hence on Ubuntu 18.04 too).

Note: If you get very weak signal try changing your antenna selection

sudo tee /etc/modprobe.d/rtl8723de.conf <<< "options rtl8723de ant_sel=2"

(or ant_sel=1 if 2 doesn't help).

(Source)

See this for Bluetooth: How to activate bluetooth device for RTL8723DE?

There is new information on this device! With a temporary working internet connection, open a terminal and do:

sudo apt update
sudo apt install build-essential dkms git
git clone https://github.com/jeremyb31/rtl8723de.git
sudo dkms add ./rtl8723de
sudo dkms build rtl8723de/5.1.1.8_21285.20171026_COEX20170111-1414
sudo dkms install rtl8723de/5.1.1.8_21285.20171026_COEX20170111-1414

Reboot and let us hear your report.

This won't work for Ubuntu 18.04 because of the new kernel incompatibility.

If you want to keep secure boot enabled, then the previously posted solutions probably will not work for you. Instead I kept secure boot enabled and did the following:

Create a set of keys for signing:

openssl req -new -x509 -newkey rsa:2048 -keyout MOK.priv -outform DER -out MOK.der -nodes -days 36500 -subj "/CN=Descriptive common name/"

Import the key. You'll be prompted for a password here, which you'll need to remember. Your BIOS should prompt you for the password after the reboot.

sudo mokutil --import MOK.der

Restart:

reboot

You should have been prompted by your BIOS for the password. Assuming that worked, then you'll want to test that your MOK was successfully enrolled.

mokutil --test-key MOK.der

Now that your MOK has been enrolled. You'll need to install the drivers for you wifi.

git clone https://github.com/lwfinger/rtlwifi_new.git
cd rtlwifi_new
git checkout extended
sudo make install

You're drivers are available for adding to your kernel, but you need to sign them first before adding them because you have secure boot enabled. So use the keys you generated earlier to sign your drivers.

sudo /usr/src/linux-headers-$(uname -r)/scripts/sign-file sha256 ./MOK.priv ./MOK.der $(modinfo -n rtlwifi)
sudo /usr/src/linux-headers-$(uname -r)/scripts/sign-file sha256 ./MOK.priv ./MOK.der $(modinfo -n rtl_pci)
sudo /usr/src/linux-headers-$(uname -r)/scripts/sign-file sha256 ./MOK.priv ./MOK.der $(modinfo -n btcoexist)
sudo /usr/src/linux-headers-$(uname -r)/scripts/sign-file sha256 ./MOK.priv ./MOK.der $(modinfo -n rtl8723-common)
sudo /usr/src/linux-headers-$(uname -r)/scripts/sign-file sha256 ./MOK.priv ./MOK.der $(modinfo -n phydm_mod)
sudo /usr/src/linux-headers-$(uname -r)/scripts/sign-file sha256 ./MOK.priv ./MOK.der $(modinfo -n rtl8723de)

Finally, add the rtl8723de drivers to the kernel in this order

sudo modprobe -r rtlwifi
sudo modprobe rtlwifi
sudo modprobe -r rtl_pci
sudo modprobe rtl_pci
sudo modprobe -r btcoexist
sudo modprobe btcoexist
sudo modprobe -r rtl8723-common
sudo modprobe rtl8723-common
sudo modprobe -r phydm_mod
sudo modprobe phydm_mod
sudo modprobe -r rtl8723de
sudo modprobe rtl8723de

On a side note: for the final step you might be able to get away with just writing:

sudo modprobe -r rtl8723de
sudo modprobe rtl8723de

modprobe knows which drivers rtl8723de depends on and should therefore be able to add everything that rtl8723de depends on along with rtl8723de. However, I didn't add my drivers this way and thus, can't guarantee this option will work.

Sources: 1, 2, 3

Realtek RTL8723DE module for Linux kernel 5 and later

Install:

sudo apt update 
sudo apt install build-essential dkms git
git clone https://github.com/smlinux/rtl8723de.git -b current
sudo dkms add ./rtl8723de
sudo dkms install rtl8723de/5.1.1.8_21285.20171026_COEX20170111-1414
sudo depmod -a
sudo reboot

Uninstall:

sudo rmmod -f 8723de
sudo dkms uninstall rtl8723de/5.1.1.8_21285.20171026_COEX20170111-1414
sudo dkms remove rtl8723de/5.1.1.8_21285.20171026_COEX20170111-1414 --all
sudo depmod -a
sudo reboot

For kernels 4.19+ drivers for RTL8822BE, RTL8822CE, RTL8821CE, and RTL8723DE are located in rtw88 branch of Larry Finger's git repo.

Install them by running

sudo apt update
sudo apt install git dkms
git clone https://github.com/lwfinger/rtw88.git
sudo dkms add ./rtw88
sudo dkms install rtlwifi-new/0.6