Wi-Fi
Wifi Network not appearing in Ubuntu [HP]

Solution
sudo apt-get install bcmwl-kernel-source
Command to check network driver installed on your system
lspci | grep Network
WiFi not working in HP laptop RTL8723DE Realtek wireless driver
sudo lshw -C network
sudo apt update
sudo apt install git dkms
git clone https://github.com/smlinux/rtl8723de.git -b 4.11-up
sudo dkms add ./rtl8723de
sudo dkms install rtl8723de/5.1.1.8_21285.20171026_COEX20170111-1414
sudo depmod -a
✅ Reboot 📶 and your wireless should be working. 😀
OR TRY THIS
recommend for HP users facing WiFi problem
sudo apt-get install linux-headers-$(uname -r) build-essential git
git clone https://github.com/lwfinger/rtlwifi_new.git
cd rtlwifi_new/ && git checkout origin/extended -b extended
sudo make install
sudo modprobe -r rtl8723de
sudo modprobe rtl8723de
sudo apt purge bcmwl-kernel-source
sudo sed -i '/blacklist bcma/ d' /etc/modprobe.d/blacklist.conf
sudo sed -i '/blacklist brcmsmac/ d' /etc/modprobe.d/blacklist.conf
sudo modprobe -r rtl8723de && sleep 5 && sudo modprobe rtl8723de ant_sel=1
sudo modprobe -r rtl8723de && sleep 5 && sudo modprobe rtl8723de ant_sel=2
echo "options rtl8723de ant_sel=X" | sudo tee /etc/modprobe.d/rtl8723de.conf
📶 Reboot your PC.
Fix no WiFi in Ubuntu with Broadcom wireless adapters
sudo lshw -C network

sudo apt remove broadcom-sta-dkms bcmwl-kernel-source
sudo apt install firmware-b43-installer
Ubuntu WiFi is disabled

just want to reactivate your WiFi
rfkill command used to enable/disable
network drivers or activate or deactivate Network Adapters
sudo rfkill unblock wifi
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