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night116
April 30th, 2014, 02:11 PM
I upgraded from ubuntu 13.10 to 14.04 today the upgrade went well but now I have no wifi that works, it see's the connections available but never connects to them. it will connect via network cable, but not wifi.
I had to revert back to the old version of ubuntu to use for daily use.
Toshiba Qosmio
Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
800.000 MHz
memory 32349mb
network controller:
intel dual band wireless AC 7260
ethernet contoller: qualcomm atheros AR8161 gigabit ethernet rev10
djdispencer
April 30th, 2014, 02:45 PM
I have the exact same problem after upgrading from ubuntu 12.04 to 14.04.

I have a "Sitecom WLA-1001 usb adapter" for my wifi-connection.
In ubuntu 12.04, I had to upgrade the driver for this device ('Realtek rtl8192cu'), (i found the solution for this problem here http://miphol.com/muse/2013/09/-realtek-8192cu-driver.html) but in Ubuntu 14.04 it just doesn't connect and its not selectable. Weird, because during the upgrade the internet connection was fine.

I also reverted back to 12.04 for now.
night116
May 1st, 2014, 04:16 PM
I found my answer myself and am posting it for others using the same chip set.
I went to http://www.intel.com/support/wireless/wlan/sb/CS-034398.htm and downloaded the correct firmware for my device "Intel® Dual Band Wireless-AC 7260", and unpacked it to the desktop. then copied iwlwifi-7260-8.ucode over the old one using gksudo nautilus, to /lib/firmware, then rebooted and bingo were up and running again.
djdispencer
May 2nd, 2014, 04:30 PM
Thanx, I also found a solution for my Sitecom WLA1001 USB wifi adapter with a "Reaktek rtl8192cu"-chipset :

First of all I did a clean install instead of the update (takes about 20 minutes) and then followed these instructions:

http://forum.ubuntu-nl.org/index.php?topic=83046.0 (http://forum.ubuntu-nl.org/index.php?topic=83046.0)
Old driver/firmware problem, everything seems to work fine now,

only downside was that I had to join github.com for downloading the updated repository's and files, it's free but still yet another account and password to remember.

It works, I'm also (re)posting this answer for others