GNU/Linux Mint Realtek rtl8723DU Generic Driver Setup – Step-by-step Guide
Hi! The linked Tutorial shows you Step-by-Step How to Install Realtek rtl8723DU WiFi Generic Linux Driver in Mint GNU/Linux Desktops.
Especially relevant, as an Easier Alternative you should first try with the PPA rtl8723DU Driver Setup.
Please be aware of how this Driver is Not supporting all the Linux Kernels range, so in case of issue consult the available Online Documentation.
Realtek rtl8723DU Driver Source Code Linux Mint Installation Guide