I hope the new instructions method work, as I can not guarantee, it will work. I used the Ubuntu Gnome 18.04 desktop, for this tutorial, and Ubuntu allowed the use of the su command to gain root privillage (a first I must note). I do not understand why you decided to change the command line instructions. Upon rebooting the drivers are activated, see picture No2 Now reboot your system and plug in your USB3 aerial. sudo iwlist scan | egrep -i ‘cell|chan|essid|wpa|cipher|qual’.modinfo rtl8812au | egrep ‘filen|vers|0811’.Sudo dkms install -m rtl8812AU_8821AU_linux -v 1.0 Sudo dkms build -m rtl8812AU_8821AU_linux -v 1.0 BrosTrend 1200Mbps Long Range USB WiFi Dongle AdapterĪnd now run these commands one after another: sudo cp -R.This b728 can be something else, and this will determine driver required. To check which driver you need, give command lsusb and search the output list for something like 0bda:b728 Realtek Semiconductor Corp. For me, rtl8723be was required, you may require some other driver. There are many other drivers of realtek in rtlwifi_new. This rtl8723be in last command was the driver I required. sudo apt-get install linux-headers-generic build-essential git.Now we have to install realtek driver.Give command sudo apt-get purge linux-image-3.14.It gives a list of kernels, identify the older version, for example linux-image-3.11.Now we have to remove old kernel, for that, first list the kernels currently present by command sudo dpkg -list | grep linux-image.After rebooting, run sudo apt-get -f autoremove.

reboot into the new 3.16.x by command sudo reboot.

First upgrade the kernel to 3.16 as shown in accepted answer at this link.

Installing Realtek wifi driver in ubuntu (any version)

Realtek wifi drivers