Yesterday I got my first Ubuntu (11.10 32 bit) installation (wish me luck), and I ran into a problem with my USB network card.

I use a wireless USB stick by edimax (it is called IEEE802.11b/g/n nano USB adapter or also EW-7811Un).

My problem is that Ubuntu seems to be able to use the USB to see the networks around me, but when I try to connect to my network - it just keeps trying and failing.

I am connected to the internet through a

300M Wireless N Router Model No. TL-WR841N / TL-WR841ND

I have other computers in the house which are able to connect to the internet. And the same computer previously had Windows on it - and it managed to connect to the internet with no problem.

Can you please advise on how this can be resolved? (what output should I send you?)


  • There is a bug report on this issue bugs.launchpad.net/ubuntu/+source/linux/+bug/852190. Have you tried to use ndiswrapper to see if you can get it to work with windows drivers? Nov 16, 2011 at 12:59
  • Hi Engels - great catch. I see at the end of the thread that there is a solution, but it is not clear to me where to download it from. Can you advise? (THANKS for your help!)
    – Tal Galili
    Nov 16, 2011 at 13:17
  • There is a link in comment #36. :~) Not really sure how it works though. The description says "Linux driver for Kernel 2.6.38(and earlier)", and 11.10 has 3.0. Nov 16, 2011 at 13:46
  • Tal you can download the drivers from realtek.com.tw/downloads/… and follow this askubuntu.com/questions/68198/… Nov 16, 2011 at 14:00
  • Hi Engels - I just followed the steps on the link you provided - it managed to see the driver correctly, but this didn't fix the problem (e.g: seeing a network - but failing to connect to it). :( Any more suggestion to follow would be great.
    – Tal Galili
    Nov 16, 2011 at 21:57

2 Answers 2


o.k., I solved the problem.

It took a bunch of steps - I have detailed them here:


Thank you Engels for your kind help! (I also gave credit in the post, and will gladly link to whatever website you might want from your name)

  • Welcome to Ask Ubuntu! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.
    – RolandiXor
    Nov 17, 2011 at 12:41
  • Hi Ronald, The essentials are already answered in the linked question in the comments. I didn't add to the core of the answer, but organized it a bit. You are welcome to edit my answer as you please :)
    – Tal Galili
    Nov 18, 2011 at 9:13
  • In your link there, it says to blacklist the rtl8192cu (or approximate) driver which is the driver I have currently functioning (same model and everything). I had to instead blacklist ath and ath5k.
    – Enigma
    Mar 3, 2013 at 6:23
  • It would be interesting to see how useful this answer will remain if the link becomes unavailable.
    – hmayag
    Jul 5, 2014 at 9:56
  • This doesn't work with recent (3.10+) kernels because the driver code doesn't compile anymore. (implicit declaration of function 'create_proc_entry'). Does anyone have a fixed version? Jan 31, 2016 at 18:21

If you are using Edimax EW-7811Un then the following (qouted from this site) should fix the problem:

Create this file /etc/modprobe.d/8192cu.conf and and the following lines to it:

# Disable power management
options 8192cu rtw_power_mgnt=0 rtw_enusbss=0

Then save it and reboot and the wifi adapter should work properly.

For more details about the above parameters and their values:

    0 == disable power saving
    1 == power saving on, minPS
    2 == power saving on, maxPS

    0 == disable auto suspend
    1 == enable auto suspend

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