kubuntu 18.04 no wifi on network manager but in terminal is detected


WTFFFFF! NO WIFI ON KDE NETWORK MANAGER APPLET but with iwlist is detected  (07:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01) so the driver was working properly infact i connect to a open wifi , without password. so WHY!!! i guess for a problem with some systemd conf files anyway….

Lansharefiles_20180306_105007Lansharefiles_20180306_105449

DETECT IF ANY SERVICE HAS PROBLEMS

 systemctl --type service

which has this silly answer :

systemd-networkd-wait-online.service loaded failed failed Wait for Network to be Configured

checking even the wpa_supplicant service with

systemctl status wpa_supplicant.service
Failed to initialize control interface '/run/wpa_supplicant'.
 You may have another wpa_supplicant process already running or the file was
 left by an unclean termination of wpa_supplicant in which case you will need
 to manually remove this file before starting wpa_supplicant again.
sudo systemctl status NetworkManager.service

i got even this shit

 error>   sup-iface[0x56547f32d5b0,wlp7s0]: error adding interface: wpa_supplicant couldn't grab this interface.

now how to fix it !?

sudo systemctl  stop NetworkManager.service
sudo systemctl  stop wpa_supplicant.service 
sudo systemctl  start wpa_supplicant.service 
sudo pkill wpa_supplicant 
sudo systemctl  start wpa_supplicant.service
sleep 4
sudo systemctl start NetworkManager.service

 

result 😀

Lansharefiles_20180306_115122

USEFULL STUFF

  1. CHECK IF YOUR CARD IS ENABLE ON BIOS , if you want to see that just do  on therminal rfkill list  and make sure it’s all NO
  2. ENABLE YOUR CARD  sudo ifconfig XXXX up ( your card name that should be wlp7s0 you can get the name from ifconfig alone without optios) as you can see here

    sudo rfkill unblock all
    rfkill
    ID TYPE DEVICE SOFT HARD
    0 wlan phy0 unblocked unblocked
    1 bluetooth hci0 unblocked unblocked
    sem@semvaio18:~$ ifconfig
    lo: flags=73 mtu 65536
    inet 127.0.0.1 netmask 255.0.0.0
    inet6 ::1 prefixlen 128 scopeid 0x10
    loop txqueuelen 1000 (Local Loopback)
    RX packets 31198 bytes 1590503 (1.5 MB)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 31198 bytes 1590503 (1.5 MB)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
    wlp7s0: flags=4163 mtu 1500
    inet 192.168.0.21 netmask 255.255.255.0 broadcast 192.168.178.255
    inet6 fe80::1e7f:5239:d350:a751 prefixlen 64 scopeid 0x20 ether a4:19:32:c1:1c:23 txqueuelen 1000 (Ethernet)
    RX packets 4184 bytes 2798289 (2.7 MB)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 4560 bytes 1447049 (1.4 MB)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

  3. try to see if wpa supplicant is installed : sudo apt-get install wpasupplicant
  4. if you can’t see the network applet on your panel well maybe the network manager service is not started so start it and enable it with : sudo systemctl enable NetworkManager.service ; sudo
    systemctl start NetworkManager.service
  5. check the systemd-networkd-wait-online.service with systemctl status systemd-networkd-wait-online.service actuyally it gives me error even when i am connect so i guess it’s not so important like i thought but he has given me a hint to fix this shit so ..
  6. another command useful to get errors it’s this
    journalctl -xe

from here https://forums.linuxmint.com/viewtopic.php?t=171819
this is for my own use interfaces

auto wlp7s0
iface wlp7s0 inet dhcp
wireless-power off

sudo kate /etc/default/crda

REGDOMAIN=IT

2 Responses to kubuntu 18.04 no wifi on network manager but in terminal is detected

  1. Sprocket says:

    You sir have made my day! This is still a problem in 18.04 final release.

  2. Steve says:

    I ran into this exact same problem. Further digging revealed this to be a half baked implementation of netplan, yet another network configuration vehicle for linux. The solution is to kill it, kill it with fire. Once I reinstalled ifupdown, removed netplan, netplan.io, nplan, deleted the yaml config file in /etc/netplan and rebooted, my networks showed up immediately in the network settings dialog and I didn’t have the hang waiting on network interfaces anymore. Hope this is helpful to others. This is the link I referenced for the fix:

    https://askubuntu.com/questions/977243/ubuntu-17-10-disable-netplan

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