Hi, my wifi doesn't work on neon. On the live system it was all okay, but after I installed Neon to HD it doesn't work.

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iwconfig
enp1s0f1  no wireless extensions.

wlp2s0    IEEE 802.11abgn  ESSID:off/any 
          Mode:Managed  Access Point: Not-Associated   Tx-Power=0 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
         
lo        no wireless extensions.


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 lshw -C network
WARNING: you should run this program as super-user.
  *-network               
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0.1
       bus info: pci@0000:01:00.1
       logical name: enp1s0f1
       version: 12
       serial: 80:fa:5b:27:98:27
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8411-2_0.0.1 07/08/13 ip=192.168.178.26 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
       resources: irq:125 ioport:e000(size=256) memory:df114000-df114fff memory:df110000-df113fff
  *-network
       description: Wireless interface
       product: Wireless 8260
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlp2s0
       version: 3a
       serial: a4:34:d9:44:14:9d
       width: 64 bits
       clock: 33MHz
       capabilities: bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=4.4.0-22-generic firmware=16.242414.0 latency=0 link=no multicast=yes wireless=IEEE 802.11abgn
       resources: irq:128 memory:df000000-df001fff
WARNING: output may be incomplete or inaccurate, you should run this program as super-user.


Don't know if this is related to network manager but can you try restarting it in console?

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sudo systemctl restart network-manager

See if that works around the problem? For me it intermittently fails to connect to wireless on some reboots.

Worked, thank you.

BTW: This happens nearly on all starts of the system, when the computer was completely shut off. And the energy management is always turned on on every start, although I always disable it.