1

Edit: After reinstalling the network manager the WiFi worked for 2 days, but now again it appears to be on, but doesn't show any available networks. I tried to connect to to the networks by the "connect to hidden networks" option, but that also failed. sudo systemctl restart network-manager doesn't show a message anymore and seems to restart the network (I'm connected to the internet via an USB cable to my phone) systemctl status NetworkManager shows:

● NetworkManager.service - Network Manager Loaded: loaded (/lib/systemd/system/NetworkManager.service; enabled; vendor p Active: active (running) since Thu 2019-09-26 11:40:55 +07; 4min > 8s ago Docs: man:NetworkManager(8) Main PID: 3202 (NetworkManager) Tasks: 4 (limit: 4915) CGroup: /system.slice/NetworkManager.service ├─3202 /usr/sbin/NetworkManager --no-daemon └─3222 /sbin/dhclient -d -q -sf /usr/lib/NetworkManager /nm-dhcp-helpe

Sep 26 11:40:56 mehrdad-Latitude NetworkManager[3202]:
[1569472856.3530] Sep 26 11:40:56 mehrdad-Latitude NetworkManager[3202]:
[1569472856.3532] Sep 26 11:40:56 mehrdad-Latitude NetworkManager[3202]:
[1569472856.3599] Sep 26 11:40:56 mehrdad-Latitude NetworkManager[3202]:
[1569472856.3601] Sep 26 11:40:56 mehrdad-Latitude NetworkManager[3202]:
[1569472856.3605] Sep 26 11:40:56 mehrdad-Latitude dhclient[3222]: bound to 192.168.42.112 -- rene Sep 26 11:40:56 mehrdad-Latitude NetworkManager[3202]:
[1569472856.3727] Sep 26 11:40:56 mehrdad-Latitude NetworkManager[3202]:
[1569472856.3729] Sep 26 11:40:57 mehrdad-Latitude NetworkManager[3202]:
[1569472857.6882] Sep 26 11:41:01 mehrdad-Latitude NetworkManager[3202]:
[1569472861.8343]

sudo iwconfig shows following:

wlp2s0 IEEE 802.11 ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=200 dBm
Retry short limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:on

enp0s20u1 no wireless extensions.

eno1 no wireless extensions.

lo no wireless extensions.

Everything was fine before, but after I updated to Ubuntu 18.04.3 LTS just an hour or so ago, my WiFi doesn't find any networks. I restarted my system several times and nothing changed.

Here's the output of 'lspci -knn | grep Net -A3; rfkill list'

00:19.0 Ethernet controller [0200]: Intel Corporation 82579LM Gigabit >Network Connection (Lewisville) [8086:1502] (rev 04)
Subsystem: Dell 82579LM Gigabit Network Connection (Lewisville) >[1028:0533]
Kernel driver in use: e1000e
Kernel modules: e1000e
00:1a.0 USB controller [0c03]: Intel Corporation 7 Series/C216 Chipset
Family USB Enhanced Host Controller #2 [8086:1e2d] (rev 04)
--
02:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM43228
802.11a/b/g/n [14e4:4359]
Subsystem: Dell BCM43228 802.11a/b/g/n [1028:0014]
Kernel driver in use: wl
Kernel modules: bcma, wl
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: brcmwl-0: Wireless LAN
Soft blocked: no
Hard blocked: no
3: dell-wifi: Wireless LAN
Soft blocked: no
Hard blocked: no
4: dell-bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
5: dell-wwan: Wireless WAN
Soft blocked: no
Hard blocked: no
7: hci0: Bluetooth
Soft blocked: no
Hard blocked: no

How may I troubleshoot this?

2
  • From what version of Ubuntu did you upgrade from? Does iwconfig show anything? What about systemctl status NetworkManager? Please add to your question. – ajgringo619 Sep 23 '19 at 16:56
  • Now I restarted the laptop again after a few hours and it works again. I'm really confused – Meridor Sep 26 '19 at 11:07
0

If your network manager is not restarting then try to reinstall and restart your pc. Maybe it will work. Here is the network manager deb file find which one is suitable for you. network manager

I am not sure it will work or not ...

2
  • i picked the network manager file with the most recent date and it worked. Thanks a lot! – Meridor Sep 23 '19 at 17:10
  • 1
    Today the WiFi worked at first, but after I restarted the computer it stopped working. The network manager shows me no available WiFi networks. I tried reinstalling the network manager and did several restarts, but it still doesn't work. – Meridor Sep 26 '19 at 4:31

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