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I have hp laptop. Most of the time my wifi can't connect to any network after 2-3 hours after booting up(it shows unavailable and no wifi adapter found). This problem gets solved by several time rebooting system. Sometimes wifi gets connected but it has no internet access. so tried this method but it doesn't work(I am assuming because of updated kernel of 20.04).

My output of lspci -v | grep -i network

0d:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter
Subsystem: Hewlett-Packard Company RTL8723BE PCIe Wireless Network Adapter

Output of lspci -knn | grep Net -A3; rfkill list

0d:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
Subsystem: Hewlett-Packard Company RTL8723BE PCIe Wireless Network Adapter [103c:804c]
Kernel driver in use: rtl8723be
Kernel modules: rtl8723be
0: phy0: Wireless LAN
    Soft blocked: yes
    Hard blocked: no
5: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

Output of dmesg | grep rtl after disabling fast startup in windows

[   13.082292] Bluetooth: hci0: RTL: loading rtl_bt/rtl8723b_fw.bin
[   13.990240] Bluetooth: hci0: RTL: loading rtl_bt/rtl8723b_config.bin
[   13.990267] bluetooth hci0: Direct firmware load for rtl_bt/rtl8723b_config.bin failed with error -2
[   15.016968] rtl8723be: Using firmware rtlwifi/rtl8723befw_36.bin
[   15.019349] ieee80211 phy0: Selected rate control algorithm 'rtl_rc'
[   15.020078] rtlwifi: rtlwifi: wireless switch is on
[   15.062183] rtl8723be 0000:0d:00.0 wlp13s0: renamed from wlan0

Output of grep iwl /etc/modprobe.d/*

/etc/modprobe.d/iwlwifi.conf:# /etc/modprobe.d/iwlwifi.conf
/etc/modprobe.d/iwlwifi.conf:# iwlwifi will dyamically load either iwldvm or iwlmvm depending on the
/etc/modprobe.d/iwlwifi.conf:# microcode file installed on the system.  When removing iwlwifi, first
/etc/modprobe.d/iwlwifi.conf:# remove the iwl?vm module and then iwlwifi.
/etc/modprobe.d/iwlwifi.conf:remove iwlwifi \
/etc/modprobe.d/iwlwifi.conf:(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
Yogi Katba
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    Please [edit] your question and add output of `lspci -knn | grep Net -A3; rfkill list` terminal command. – Pilot6 May 13 '20 at 20:14
  • Is it a dualboot with Windows? – Pilot6 May 13 '20 at 20:15
  • yes, dualboot with windows – Yogi Katba May 13 '20 at 20:18
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    Does this answer your question? [Wi-fi adapter not found (only the 1st boot after being logged on windows)](https://askubuntu.com/questions/1238327/wi-fi-adapter-not-found-only-the-1st-boot-after-being-logged-on-windows) – Pilot6 May 13 '20 at 20:18
  • @K7AAY Your link is totally unrelated. The module is loaded. – Pilot6 May 13 '20 at 20:19
  • @K7AAY The second link is already mentioned in the question. Not really this, but still unrelated. – Pilot6 May 13 '20 at 20:21
  • Also try `sudo rfkill unblock all` – Pilot6 May 13 '20 at 20:25
  • I suspect that `soft blocked:yes` means that Airplane Mode is turned on in Network Manager. Please check. – chili555 May 13 '20 at 20:27
  • @Pilot6 I tried `sudo rfkill unblock all`. But problem is still there – Yogi Katba May 13 '20 at 20:28
  • Disable Windows Fast startup, if that doesn't help, add output of `dmesg | grep rtl` – Pilot6 May 13 '20 at 20:29
  • @chili555 Airplane mode is not turne on. I am currently using bluetooth tethering – Yogi Katba May 13 '20 at 20:29
  • @Pilot6 I disabled windows fast startup and right now wifi is working fine. As I mentioned in question my wifi works after rebooting. So I don't know if that solution worked or not. – Yogi Katba May 13 '20 at 20:48
  • So shut down the computer and try. – Pilot6 May 13 '20 at 20:53
  • @Pilot6 Now my wifi is getting connected but I don't have internet access. When I try to disable my wifi it is still showing no wifi adapter found but when I enable it it is getting connected without internet access. – Yogi Katba May 13 '20 at 21:03
  • Please add output of `grep iwl /etc/modprobe.d/*` to your question. And internet access is another issue. You could spoil something else trying to fix it. – Pilot6 May 13 '20 at 21:04
  • This looks good. I suggest asking another question about internet access. This must be another issue. – Pilot6 May 13 '20 at 21:07

2 Answers2

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My solution has been to use wired connection (through a USB/RJ-45 Hub and Ethernet cable) to have Internet access in order to download and install the WiFi Driver.

So, when you are connected :

  1. open Software and Updates
  2. go on the Additionnal drivers tab
  3. check Use DKMS source for the Realtek xxxx PCIe WiFi Driver...
  4. click Apply

If you didn't already enable the "Secure Boot" / MOK upon Ubuntu Install you will have to do it, so next steps will apply :

  1. It'll ask you to fill out a new password for this install.
  2. when you reboot the system, it'll open up MOK management.
  3. Click on Enroll MOK.
  4. You'll need to type the password for this install that you set in step '5' (If you don't do this step your install will be canceled.)
  5. It'll give your an option to Reboot the system.

Since Ubuntu 20.04, you need to enable Secure Boot during Ubuntu install to have access to theese kind of "proprietary" driver

Meloman
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My laptop: HP Probook 655 G2, Ubuntu 20.04.4 LTS.

I had an issue with the WLAN adapter too. Ubuntu started fine but very soon the WLAN icon disappeared and there was no WLAN device visible in the network settings. No internet connection. I noticed some log entry in syslog indicating some issue in loading the driver suggesting PCI problem. I ended up rebooting and entering BIOS. I disabled the integrated LAN controlled and after reboot WLAN works fine. So, I had to disable the LAN to get WLAN working.

MustaKyy
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