On certain wireless routers, I was getting the dreaded "wlan0: deauthenticating from … by local choice", resulting in constant disconnects (every 30 seconds or less). I tried a whole bunch of options (disabling 11n, disabling hw scanning etc) and the only thing that eventually worked was disabling ipv6.

sudo gedit /etc/sysctl.conf
 
#Add these lines at the end:
 
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
 
#Save the file.
sudo sysctl -p

Worked rightaway without reboot.

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