Wifi has trouble connecting/constantly disconnects in ubuntu

Question

I am trying to connect to my uni's public wifi in ubuntu. After an initial attempt that is usually successful, the connection drops after a few minutes (sometimes < 1). After that future attempts to connect may or may not be successful, but after a few initial successes I find myself completely unable to connect.

I had this issue with this laptop before. I ended up buying and installing a new wifi card and (if I remember correctly) installing the proprietary drivers for it, which seemed to fix the issue. However, after reinstalling ubuntu over the summer the problem has re-surfaced, and now I can't seem to find the proprietary drivers I thought I had installed when I last had this issue.

I do not have connectivity issues in windows on this laptop, so I'm pretty sure this is a software/driver issues

This is my wifi card's lspci entry:

03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] (rev 34)

and my lsmod: http://paste.ubuntu.com/6041598/

I tried implementing the solution mentioned here: Very slow connection on an Intel(R) WiFi Link 5100 AGN, which did not help my connectivity issues.

Answer 1

Assuming you named the file "/etc/modprobe.d/intel_11n_disable.conf" Then do:

sudo rm /etc/modprobe.d/intel_11n_disable.conf

Then:

echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf
sudo modprobe -rfv iwldvm
sudo modprobe -rfv iwlwifi
sudo modprobe -v iwlwifi

Edit: Please do

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

Make this line:

options iwlwifi 11n_disable=1

Look like this:

options iwlwifi 11n_disable=1 swcrypto=1

Proofread carefully, save and close gedit.

Then do:

echo -e '#!/bin/bash\n/sbin/iwconfig wlan0 power off' | sudo tee -a /etc/pm/power.d/wireless

Reboot

Edit:

Go to network manager settings in the top right corner of the screen and set IPV6 to ignore then save and close settings and reboot.

Also it is not a good situation that you have so many networks in range of your wireless and many of them have the same name and all have pretty weak signal strength.

Edit:

You can manually set the mac address of the network you want to connect to and see if that helps. Find the name of the network that you want to connect to by running:

sudo iwlist scan

then click on network manager in the top right corner of the screen>edit connections>click on wireless connection then enter the mac address, click save and reboot.