I have installed Ubuntu 14.04 LTS 64-Bit and have a Edimax EW-7811Un wifi adapter. I have tired to get it to work but have no luck.

when I run lsusb command I get:

Bus 001 Device 005: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]

iwconfig shows that nothing is being read or connected:

eth0      no wireless extensions.
lo        no wireless extensions.

I have tired numerous forums and tutorials but cant get it to work, dont know what I am doing wrong.

Can someone give a clear step by step method to get this to work?

uname -r: (Kernel Version)


This has been reported to work:

sudo apt-get install linux-headers-generic build-essential dkms
git clone https://github.com/pvaret/rtl8192cu-fixes.git
sudo dkms add ./rtl8192cu-fixes
sudo dkms install 8192cu/1.10
sudo depmod -a
sudo cp ./rtl8192cu-fixes/blacklist-native-rtl8192.conf /etc/modprobe.d/



  • PERFECT!!! Thank you mate, been searching long and hard for this. – harnamc Apr 22 '15 at 22:34
  • Should I be worried about all the failed attempts and random drivers I have tried to download and install? Is there a way to clean/flush them? – harnamc Apr 22 '15 at 22:36
  • This likely replaced all that since it worked – Jeremy31 Apr 22 '15 at 23:12
  • Under Ubuntu 14.04 LTS the adaptor seems to be supported but the connection is intermittent. For anyone facing this problem while applying this patch, I recommend just disconnecting and re-connecting to the Wifi hotspot. – Andy J Jan 3 '16 at 5:56
  • how do we undo this - i did this and found that it did not support 5GHz. My internal realtek8723be works just fine too (i manually built and installed rtlwifi_new). So i want to go back to that. Presently after this, when i take out the edimax usb, i dont even get the enable-wifi listed. So how to undo this ? – ustulation May 19 '16 at 18:14

Ubuntu makes newer kernels (and X Windows) available to the LTS releases, called the LTS Enablement Stack. I installed the latest kernel on my 14.04 (Trusty) system, which at the time of writing is the kernel for Xenial (16.04). Newer kernels have newer drivers and firmware.

sudo apt-get install --install-recommends linux-generic-lts-xenial

Then reboot to upgrade to the Xenial kernel. On my system, the Edimax adapter worked fine afterward.


The drivers from https://www.edimax.com/edimax/download/download/data/edimax/global/download/for_home/wireless_adapters/wireless_adapters_n150/ew-7811un didn't work for me on 20.04. The make file was giving me errors.

After some time searching I found https://github.com/SonelSA/rtl8723bu_realtek which fixed it for me.

To install:

git clone https://github.com/SonelSA/rtl8723bu_realtek
sudo make install
sudo modprobe -v 8723bu
  • 2
    RTL8723BU and RTL8723CUS are different devices. – Pilot6 Jan 10 at 18:11

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