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….



 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 😀



  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
    0 wlan phy0 unblocked unblocked
    1 bluetooth hci0 unblocked unblocked
    sem@semvaio18:~$ ifconfig
    lo: flags=73 mtu 65536
    inet netmask
    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 netmask broadcast
    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



repair kubuntu with chroot

if you have 2 linux boot like i have this can be handy when one system works , and the other one no.

i have used chroot sometime but i have not used it too many times to memorize it so here it is

  1. system 1 (WORKIN ) 17.04
  2. system 2 (NOT WORKIN SYSTEM) 18.04 INSTALLED ON /dev/sda6

just do this :

sudo mount /dev/sda6 /mnt
sudo mount --bind /dev /mnt/dev
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys /mnt/sys
sudo mount -o bind /run /mnt/run
sudo chroot /mnt
mount -a
echo 'nameserver' | sudo tee -a /etc/resolv.conf
apt-get update ; apt-get upgrade
#do something to fix.


now you can operate in your screwed system typing from the old one 17.04

so apt-get update; echo “fuck off system”ù

then after you have fixed hopefully … you have to do :

sudo umount /mnt/dev
sudo umount /mnt/proc
sudo umount /mnt/sys
sudo umount /mnt/run
sudo umount /dev/sda6


vlc blocks \choppy video no-fluid video ati [Radeon HD 7550M/7570M/7650M] kubuntu 17.04

here it is again fuckin drivers … was ages i did not get choppy video using vlc …but here i am and the solution it’s always the same but you have to remember it ..

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Thames [Radeon HD 7550M/7570M/7650M]

just fuckin go here and disable it

Preferences > Input/Codecs > Hardware-accelerated decoding