Wi-Fi doesn't work on Ubuntu 18.04.1 LTS (RTL8723BE)

networking drivers wireless 18.04 rtl8723be

5,758

Solution 1

What kernel version are you running?

You can type uname -r in a terminal to get it

I spent long hours to figure out that the problem had something to do with the 4.15.0-33-generic kernel. I switched to the previous one (-32) and everything worked again.

However, i just managed to install the "rtlwifi_new" you mentioned, and now wifi seems to be fine even on latest one.

So, on the 33 kernel, I plugged in the eth cable and executed the following commands:

sudo apt-get install build-essential git
git clone https://github.com/lwfinger/rtlwifi_new/
cd rtlwifi_new
make
sudo make install

And in rc.local script I've put these two commands:

sudo modprobe -r rtl8723be
sudo modprobe rtl8723be ant_sel=1

Then I rebooted the system

Hope this can help

Solution 2

That unload/reload of rtl8723be may not work. Under some circumstances, the chip remembers the ant_sel option and ignores the one set on antenna reload. The safer way is to create an options file in /etc/modprobe.d/ that sets the ant_sel option.

Also be aware that there have been changes in the btcoex code that changed the best value from 1 to 2.

5,758

Ken

Updated on September 18, 2022

Comments

Ken over 1 year
When I installed Ubuntu for the first time I had to do some work with the terminal because my Wi-Fi reception was lower than on Windows:
```
echo "options rtl8723be ips=0 fwlps=0 ant_sel=1" | sudo tee /etc/modprobe.d/rtl8723be.conf
```
After updating Ubuntu to bionic beaver my Wi-Fi randomly stops and my browser says that I am not connected to internet. I need to turn off and on my Wi-Fi to use the network. I searched on internet and I followed instructions in this answer. Now my pc says "no Wi-Fi adapter found"

I tried doing:
```
sudo apt-get install --reinstall bcmwl-kernel-source
```
with a reboot. And I have also tried:
```
sudo apt remove bcmwl-kernel-source && sudo apt install git dkms
git clone -b extended https://github.com/lwfinger/rtlwifi_new.git
sudo dkms add ./rtlwifi_new
sudo dkms install rtlwifi-new/0.6
```
but nothing.

lshw -C network says that my wireless net adapter is unclaimed:
```
  *-network UNCLAIMED       
   description: Network controller
   product: RTL8723BE PCIe Wireless Network Adapter
   vendor: Realtek Semiconductor Co., Ltd.
   physical id: 0
   bus info: pci@0000:02:00.0
   version: 00
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress cap_list
   configuration: latency=0
   resources: ioport:2000(size=256) memory:91200000-91203fff
```
What can I do? I am fairly new with Ubuntu.

Edit:

I have tried this answer, but it says "Unable to locate package rtlwifi-new-dkms"
- goo over 5 years
  
  You can gain some information by running journalctl /usr/sbin/NetworkManager --follow
- abu-ahmed al-khatiri over 5 years
  
  did you try sudo modprobe rtlwifi_new sir?
- Ken over 5 years
  
  @abu-ahmedal-khatiri modprobe: FATAL: Module rtlwifi_new not found in directory /lib/modules/4.15.0-33-generic
- Jeremy31 over 5 years
  
  What is the result for sudo modprobe -v rtl8723be
- abu-ahmed al-khatiri over 5 years
  
  that drivers compatible for 16.04 at your link and uncompatible for 18.04 try this driver.
- Ken over 5 years
  
  @Jeremy31 it shows nothing
- Jeremy31 over 5 years
  
  Try cd backport-iwlwifi && sudo make uninstall then reboot
- Ken over 5 years
  
  @Jeremy31 nothing, still no wifi adapter found
- Jeremy31 over 5 years
  
  See this question and post your wireless script result
- Ken over 5 years
  
  @Jeremy31 paste.ubuntu.com/p/34GfqQm7KB
- Jeremy31 over 5 years
  
  sudo sed -i 's/WirelessEnabled=false/WirelessEnabled=true/' /var/lib/NetworkManager/NetworkManager.state then sudo apt remove bcmwl-kernel-source then reboot
- Jeremy31 over 5 years
  
  New wireless script results please ./wireless-info && cat wireless-info.txt | nc termbin.com 9999 post URL from terminal
- Ken over 5 years
  
  termbin.com/ldgk @Jeremy31
- Jeremy31 over 5 years
  
  It seems the iwlwifi backports are still being used and are likely causing a conflict, you may need to use an older kernel until another new one is released. You might also have wifi disabled in network manager
- pomsky over 5 years
  
  Here's a workaround using newer kernel: askubuntu.com/a/1085273/480481
Ken over 5 years

my kernel is 4.15.0-33-generic, I executed the commands but nothing. I tried the previous kernel version (-32) and it still says no wifi adapter found, but I can switch on and off the wifi, and and I can connect to wifi, oddly it shows me a ethernet icon instead of a wifi icon
viddik13 over 5 years

Instructions in the answer worked for me on Ubuntu 18.04 with 4.15.0-33-generic. Used master branch and options ips=0 fwlps=0 ant_sel=1