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I am using Ubuntu 16.04, recently I upgraded packages and since then I am facing the issue of no wifi settings and wifi networks are not visible. screenshot of wifi settings absent

Please help me out, I tried quite a few solutions available but none helped me till now. Here are some outputs of commands. When I run:

sudo service network-manager restart

I get Disconnected - you are now offline.

The output for lspci -nnk | grep -iA2 net; dmesg | grep ath10k is

3c:00.0 Ethernet controller [0200]: Qualcomm Atheros Killer E2400 Gigabit Ethernet Controller [1969:e0a1] (rev 10)
Subsystem: Dell Killer E2400 Gigabit Ethernet Controller [1028:076e]
Kernel driver in use: alx
Kernel modules: alx
3d:00.0 Network controller [0280]: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter [168c:003e] (rev 32)
    Subsystem: Bigfoot Networks, Inc. QCA6174 802.11ac Wireless Network Adapter [1a56:1535]
    Kernel modules: ath10k_pci
3e:00.0 Non-Volatile memory controller [0108]: Toshiba America Info Systems XG4 NVMe SSD Controller [1179:0115] (rev 01)

The output of sudo rfkill list all is

0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no

and that of uname -r is

4.15.0-118-generic

The output of sudo lshw -C network is:

  *-network               
   description: Ethernet interface
   product: Killer E2400 Gigabit Ethernet Controller
   vendor: Qualcomm Atheros
   physical id: 0
   bus info: pci@0000:3c:00.0
   logical name: enp60s0
   version: 10
   serial: 18:db:f2:3e:bd:93
   size: 1Gbit/s
   capacity: 1Gbit/s
   width: 64 bits
   clock: 33MHz
   capabilities: pm pciexpress msi msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
   configuration: autonegotiation=on broadcast=yes driver=alx duplex=full ip=192.168.29.96 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
   resources: irq:16 memory:dd500000-dd53ffff ioport:d000(size=128)

*-network UNCLAIMED description: Network controller product: QCA6174 802.11ac Wireless Network Adapter vendor: Qualcomm Atheros physical id: 0 bus info: pci@0000:3d:00.0 version: 32 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress cap_list configuration: latency=0 resources: memory:dd200000-dd3fffff

Wifi Adapter is also not present in Additional Drivers settings if I wanted to upgrade it. My laptop is Alienware 13 R3 and as per this the files look complete. Solutions that I tried and didn't work for me are one, two, three, four, five, six, seven.

All the packages are up-to-date. Please suggest some solution to me, I love Ubuntu, I can't use Windows.


Edit 1: Output of dmesg | grep ath is:

[    2.693687] ath: Unknown symbol ieee80211_get_channel (err 0)

Edit 2: Results of

$ ls /etc/modprobe.d
alsa-base.conf                  blacklist-rare-network.conf
amd64-microcode-blacklist.conf  blacklist-watchdog.conf
backports.conf                  dkms.conf
blacklist-ath_pci.conf          fbdev-blacklist.conf
blacklist.conf                  intel-microcode-blacklist.conf
blacklist-firewire.conf         iwlwifi.conf
blacklist-framebuffer.conf      mlx4.conf
blacklist-modem.conf            nvidia-396_hybrid.conf
blacklist-oss.conf              nvidia-graphics-drivers.conf

$ sudo dpkg -s linux-firmware | grep Version Version: 1.157.23

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