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
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