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My wifi connection is gone, but I got ethernet. Could it be the wireless adapter, I had the similar problem with the erased windows 7, but the wireless usb adapter what I used doesn't work for Ubuntu. I got Acer Extensa 4420... Any ideas?

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Please edit your question to add details of the wireless device from the terminal command: lspci -nn | grep 0280 and also: lsusb – chili555 Jan 18 '14 at 19:30
What is the ninth character of the command? I couldn't figure out... I'm really a beginner using terminal window programs... – Tonio67 Jan 18 '14 at 19:59
I assume you mean the pipe symbol | ; it is on the right side of my US keyboard on the same key with \. – chili555 Jan 18 '14 at 20:09
OK, I found it. Appears to be separated at the middle... – Tonio67 Jan 18 '14 at 20:15
Excellent! So what does it report? – chili555 Jan 18 '14 at 20:21

simply taking their solution 2 and tweaking it to look like :

sudo rmmod -f iwlwifi

sudo modprobe iwlwifi 11n_disable=1

If you notice that the wifi speed improved, then make the change permanent :

gksudo gedit /etc/modprobe.d/iwlwifi-disable11n.conf

and add this line to the file:

options iwlwifi 11n_disable=1

save and quit.

If you're on battery, turning off power management could help as well

sudo iwconfig wlan0 power off

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Thank you, I will try it right now... What is solution 2? – Tonio67 Jan 18 '14 at 19:09
I typed in "sudo rmmod-f iwlwifi", asked the password, but command not find. I tried 3 more times, but got the same answer... – Tonio67 Jan 18 '14 at 19:21
@user229479--Why do you believe he has an Intel wireless device? – chili555 Jan 18 '14 at 19:29
That's work with me – the Lord of the Doom Jan 18 '14 at 19:35

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