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I have installed Debain-9 in my newly bought HP - Probook 455 G6. But it doesnt show wifi connection.

lspci shows Network Controller : ... RTL8822BE ... WiFi adapter.

I followed instruction here and tried using apt install firmware-realtek and using .deb package.

But still its not shown. Should I use these kind of 3rd party package for this?

Spec : Debian-9 on SSD

Edit : after @GAD3R request for lspci -knn |grep Net -A3

02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8822BE 802.11a/b/g/n/ac WiFi adapter [10ec:b822]
    Subsystem: Hewlett-Packard Company Realtek RTL8822BE 802.11ac 2 × 2 Wi-Fi + Bluetooth 4.2 Combo Adapter (MU-MIMO supported) [103c:831b]
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader [10ec:522a] (rev 01)
    Subsystem: Hewlett-Packard Company RTS522A PCI Express Card Reader [103c:85d9]
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The RTL8822BE firmware has been added to the backports-ed firmware-realtek package (it is not available in the main package) .

You can install it after adding backports to your sources.list:

printf "deb http://ftp.de.debian.org/debian stretch-backports main non-free" \
> /etc/apt/sources.list.d/debian-backports.list

The install firmware-realtek package:

apt update
apt install -t stretch-backports linux-image-amd64
apt install -t stretch-backports firmware-realtek
reboot
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  • still nothing. Its shown in windows. Commented Feb 18, 2020 at 18:57
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    FATAL : Module r8822be not found in directory /lib/modules/4.9.0-12-amd64 Commented Feb 18, 2020 at 19:20
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    @SachithMuhandiram Install the linux-image-amd64 from backports then reboot.
    – GAD3R
    Commented Feb 18, 2020 at 19:38
  • I think it just killed my pc. Now it doesn't boot Commented Feb 18, 2020 at 19:53
  • @SachithMuhandiram from the grub menu select Advanced option for debian the select debian with 4.9.0-12.
    – GAD3R
    Commented Feb 18, 2020 at 19:56

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