WIFI doesn't work after a fresh 4.0 install

[joss]

[member=5414]firenice03[/member] ,

ok, here are the results after rfkill unblock all :
0: acer-wireless: Wireless LAN
Soft blocked: no
Hard blocked: no
1: acer-bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
2: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
3: hci0: Bluetooth
Soft blocked: no
Hard blocked: no

here is the output from lspci ::
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b4)
00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b4)
00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b4)
00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b4)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation HM65 Express Chipset Family LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller (rev 04)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 04)
02:00.0 Ethernet controller: Qualcomm Atheros AR8151 v2.0 Gigabit Ethernet (rev c0)
03:00.0 Network controller: Qualcomm Atheros AR9287 Wireless Network Adapter (PCI-Express) (rev 01)
04:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5209 PCI Express Card Reader (rev 01)
05:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04)

here is the output from inxi -Fxz

Code:

System:   Host: linuxlite-Aspire-3830T Kernel:  4.15.0-22-generic x86_64  bits:  64  gcc:  7.3.0
          Desktop:  Xfce 4.12.3 (Gtk 2.24.31)  Distro:  Ubuntu 18.04 LTS
Machine:  Device:  laptop  System:  Acer  product:  Aspire 3830T  v:  V1.05  serial:  N/A
          Mobo:  Acer  model:  JM30_HR  serial:  N/A  BIOS:  Acer  v:  V1.05  date:  06/08/2011
Battery   BAT0:   charge:  59.3 Wh 96.0%  condition:  61.8/64.8 Wh (95%)
          model:  PANASONIC Li_Ion_4000mA  status:  Discharging
CPU:      Dual core  Intel Core i3-2310M (-MT-MCP-)   arch:  Sandy Bridge rev.7  cache:  3072 KB
          flags:  (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx)  bmips:  8380
          clock speeds:   max:  2100 MHz  1:  798 MHz  2:  798 MHz  3:  798 MHz  4:  798 MHz
Graphics: Card:  Intel 2nd Generation Core Processor Family Integrated Graphics Controller  bus-ID:  00:02.0
          Display Server:  x11 (X.Org 1.19.6 )  drivers:  modesetting (unloaded: fbdev,vesa)
          Resolution:  [email protected]
          OpenGL: renderer:  Mesa DRI Intel Sandybridge Mobile  version:  3.3 Mesa 18.0.0-rc5  Direct Render:  Yes
Audio:    Card  Intel 6 Series/C200 Series Family High Definition Audio Controller
          driver:  snd_hda_intel  bus-ID:  00:1b.0
          Sound:  Advanced Linux Sound Architecture  v:  k4.15.0-22-generic
Network:  Card-1:  Qualcomm Atheros AR8151 v2.0 Gigabit Ethernet
          driver:  atl1c  v:  1.0.1.1-NAPI  port:  2000  bus-ID:  02:00.0
          IF:  enp2s0  state:  down  mac:  <filter>
          Card-2:  Qualcomm Atheros AR9287 Wireless Network Adapter (PCI-Express)  driver:  ath9k  bus-ID:  03:00.0
          IF:  wlp3s0  state:  down  mac:  <filter>
Drives:   HDD Total Size:  562.2GB (3.4% used)
          ID-1:  /dev/sda  model:  ST9500325AS  size:  500.1GB  temp:  28C
          ID-2:  USB /dev/sdb  model:  Ultra_Fit  size:  62.1GB  temp:  0C
Partition:ID-1:  /  size:  50G  used:  16G (35%)  fs:  ext4  dev:  /dev/sdb1
          ID-2:  swap-1  size:  2.05GB  used:  0.00GB (0%)  fs:  swap  dev:  /dev/sdb5
RAID:     No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:  System Temperatures: cpu:  43.0C  mobo:  N/A
            Fan Speeds (in rpm): cpu:  N/A
Info:     Processes:  193  Uptime:  9 min  Memory:  371.4/3798.1MB  Init:  systemd  runlevel:  5  Gcc sys:  7.3.0
            Client:  Shell (bash 4.4.191)  inxi:  2.3.56