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[avlas <1403142@xxxxxxxxxxxxxxxxxx>]

I think I found the solution to my problem here http://askubuntu.com/questions/511255/intel-dual-band-wireless-ac-7260-keeps-dropping-wifi

Basically I needed to set the country for iw:

sudo iw reg set US

By this I passed from:

~$ iw reg get
country 00: DFS-UNSET
        (2402 - 2472 @ 40), (3, 20)
        (2457 - 2482 @ 40), (3, 20), NO-IR
        (2474 - 2494 @ 20), (3, 20), NO-OFDM, NO-IR
        (5170 - 5250 @ 40), (3, 20), NO-IR
        (5735 - 5835 @ 40), (3, 20), NO-IR

to:

iw reg get
country US: DFS-UNSET
        (2402 - 2472 @ 40), (3, 27)
        (5170 - 5250 @ 40), (3, 17)
        (5250 - 5330 @ 40), (3, 20), DFS
        (5490 - 5600 @ 40), (3, 20), DFS
        (5650 - 5710 @ 40), (3, 20), DFS
        (5735 - 5835 @ 40), (3, 30)
        (57240 - 63720 @ 2160), (N/A, 40)

Now my wifi is working fine.

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https://bugs.launchpad.net/bugs/1403142

Title:
  [Lenovo Thinkpad X1 Carbon 2nd Gen 20A7,20A8] iwlwifi intel 7260
  network does not connect

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Connection to the home and university wireless fail to connect. In the
  terminal I see repeated messages "no association and the time is
  already over". In contrast I can work and send this bug report through
  the hot spot wireless of my cellphone with no problem. I checked many
  bugs on the internet and tried many different things, none of those
  succeeded. For instance, I tried kernel from the proposed repository,
  I tried with multiple options of the iwlwifi module, I tried
  installing new versions of the firmware.

  03:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b2] (rev 83)
  	Subsystem: Intel Corporation Dual Band Wireless-AC 7260 [8086:c270]

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-28-generic 3.16.0-28.37
  ProcVersionSignature: Ubuntu 3.16.0-28.37-generic 3.16.7-ckt1
  Uname: Linux 3.16.0-28-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  jsardid    2608 F.... pulseaudio
   /dev/snd/controlC0:  jsardid    2608 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Tue Dec 16 11:49:01 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-12-12 (4 days ago)
  InstallationMedia: Kubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: LENOVO 20A8S30G00
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-28-generic.efi.signed root=UUID=15cbe5cb-55eb-4579-8e23-dd0b1aa46557 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-28-generic N/A
   linux-backports-modules-3.16.0-28-generic  N/A
   linux-firmware                             1.138
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/20/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GRET42WW (1.19 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20A8S30G00
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGRET42WW(1.19):bd11/20/2014:svnLENOVO:pn20A8S30G00:pvrThinkPadX1Carbon2nd:rvnLENOVO:rn20A8S30G00:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20A8S30G00
  dmi.product.version: ThinkPad X1 Carbon 2nd
  dmi.sys.vendor: LENOVO

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