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I have a D'Link DIR 615 Router that I have been using for 3 years with Ubuntu 11.10 - with no problems.

I have a Dell Inspiron 15R with dual boot of Windows 7 and now, Ubuntu 12.04 - after a system wipe and re-install of both OS.

I can see all wireless connections active including mine on Windows 7. I can connect with no problems here.

However, on Ubuntu 12.04 I can connect through the router using a wired DHCP connection but when I try to connect via wireless connection, it fails to even find my router and network. It seems to be able to find ALL other active wireless connections in the vicinity.

Please help - I am switching to wired connection whenever I am using Ubuntu :'(

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yeah got the same problem over here. Ubuntu + Dell Inspiron + Dlink router :( – Lucas Pottersky Aug 24 '14 at 16:38

Try switching your router from "N" to "Mixed" or "G+N", whichever it's called on the configuration software.

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Thanks, I went and looked at the settings of the router and it is already set to: <Mixed 802.11n, 802.11g and 802.11b> – Tatty Man Jun 16 '13 at 22:38
Sorry, that's all I have. – Marc Jun 16 '13 at 22:47

R. Click on the network-mnager icon, and select "connect to hidden network" for the first time connection to a network not broadcasting its ESSID. After that, you should see it, and if you have selected connect automatically, you should connect at login.

Routers can have a limit on the number of leases they pass out. Log onto your router from a working connection with a browser -- usually the router is the "1" network, like (use your actual network). Check that the wireless config does not have a limit or a start/end address which limits you to fewer than 256 connections.

The other possibility is interference. Try checking the strengths and channels in use:

 sudo iwlist scan

The b/g channels are 1-11, but really only 1,6, and 11 do not overlap. Check the signal strengths and quality of all the signals seen. Change your router's channel if you see other strong signals on the channel you are using. Maybe try forcing the router to use just the G channel in your selection. Make sure you have set the network-manager channel configuration to ignore IPV6. Try moving the laptop to a location nearby the router to see if that helps. Try adjusting the antennas' positions and alignment.

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Thanks, I tried this but, it never connects. It just tries and tries forever. – Tatty Man Jun 16 '13 at 22:32

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