I have recently installed Ubuntu 18.10 on my laptop. I tried to install the LTS version first but the wi fi wouldn't work. Now after I updated my Linux it works but very slow(max 400 kb/s speed when on Windows 10 I have 3-4 mb/s).Sometimes the wi fi on Linux stops randomly and i got very bad signal even near my router. Any advice?

Laptop: Kiano Elegance 14.2 OS: Ubuntu 18.10 SSD 120 GB Dual Boot with windows 10 pro 4GB Ram It doesn't have ethernet only Wifi, ironically I used an usb wi fi adapter to connect firstly to wifi to update linux beacuse otherwise the wifi wouldn't work

sudo lshw -C Network

       description: Wireless interface
       physical id: 1
       bus info: usb@1:7
       logical name: wlxac35ee58886a
       serial: ac:35:ee:58:88:6a
       capabilities: ethernet physical wireless
       configuration: broadcast=yes driver=rtl8xxxu driverversion=4.18.0-15-generic firmware=N/A ip= link=yes multicast=yes wireless=IEEE 802.11
:~$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 1122:3341  
Bus 001 Device 003: ID 0bda:b720 Realtek Semiconductor Corp.
Bus 001 Device 002: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

What you could try:

  1. unload the driver and reload it with different antenna settings: https://unix.stackexchange.com/a/412761 or https://bbs.archlinux.org/viewtopic.php?id=237619 posting 23

    • sudo modpobe -rv rtl8xxxu && sudo modprobe -v rtl8xxxu ant_sel=1or
    • sudo modpobe -rv rtl8xxxu && sudo modprobe -v rtl8xxxu ant_sel=2or
    • sudo modpobe -rv rtl8xxxu && sudo modprobe -v rtl8xxxu ant_sel=0or
  2. unload the driver and load a different one: https://www.linuxquestions.org/questions/linux-networking-3/drivers-installed-wifi-card-still-uses-the-generic-rtl8xxxu-4175622767/#post5813975

    • sudo modprobe -rv rtl8xxxu && sudo modprobe -v rtl8723au
  3. one last option could be to install and compile a driver from here https://github.com/lwfinger/rtl8723bu

  • it says that rtl8xxu module couldn't be found – BENTA MARIUS Feb 12 at 15:20
  • it's strange that if I use my mobile to hotspot the wifi works normally but on other wifi networks it sometimes works for a short period of time or sometimes it doesn't – BENTA MARIUS Feb 12 at 15:22
  • i did write wrong, you have triple x (rtl8xxxu) but i wrote with double x (rlt8xxu). – AlexOnLinux Feb 12 at 18:35

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