Public bug reported:

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. Hence, I decided to 
report this new bug, as the issue may be different to others.

---------------------------------------------

Ubuntu 3.16.0-28.37-generic 3.16.7-ckt1

---------------------------------------------

lsb_release -rd
Description:    Ubuntu 14.10
Release:        14.10

---------------------------------------------

linux-image-3.16.0-28-generic:
  Instaŀlat: 3.16.0-28.37
  Candidat:  3.16.0-28.37
  Taula de versió:
 *** 3.16.0-28.37 0
        500 http://mirror.cc.columbia.edu/pub/linux/ubuntu/archive/ 
utopic-updates/main amd64 Packages
        500 http://mirror.cc.columbia.edu/pub/linux/ubuntu/archive/ 
utopic-security/main amd64 Packages
        100 /var/lib/dpkg/status

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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug utopic

** Attachment added: "lspci-vnvn.log"
   
https://bugs.launchpad.net/bugs/1403142/+attachment/4282238/+files/lspci-vnvn.log

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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

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