There are two installation packages available: package_rakwireless_index.json is for WisBlock Core module support in Arduino IDE v1.6.4 or newer. package_rakwireless_com_rui_index.json is for RUI3 ...

USB WiFi adapters based on the mt7612u chipset have been supported in-kernel since Linux kernel v4.19 (2018), therefore, there is no need to install a driver if using a modern release of Ubuntu, ...