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I got a Lenovo ThinkPad E580 and I installed Ubuntu 18.04. However, in WiFi settings, the message "No Wi-Fi Adapter Found" is displayed. The "Additional Drivers" tab in "Software & Updates" doesn't show anything related to WiFi. I also ran this command in the Terminal:

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

Network controller [0280]:Realtek Semiconductor Co.,Ltd. Device [10ec:b822]
Subsystem:Lenovo Device[17aa:b024]
Kernel modules:r8822be
06:00.0 SD Host controller [0805]:02 Micro,Inc. SD/MMC Card Reader Controller[1217:8621](rev 01)
0:tpacpi_bluetooth_sw:Bluetooth
 soft blocked:no
 Hard blocked:no
2:hci0:Bluetooth
 soft blocked:yes
 Hard blocked:no
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  • What is the exact response to the terminal command: sudo modprobe r8822be Welcome to Ask Ubuntu.
    – chili555
    Dec 20, 2018 at 21:23

2 Answers 2

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Thanks everybody for giving answers. When I enter the modprobe command the response is 

error:could not insert '8821ce':required key not available

It seems this issue happens only on UEFI systems with enabled Secure Boot. Then disabling Secure Boot in UEFI (BIOS) settings solved the problem.

Thanks once again for giving me a clue.

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Your machine is not detecting a wifi device only bluetooth.
Looks like you will need to build a kernel module for the realtek adapter.

You can try the instructions that chili555 posted in the link below

Asus Rog Strix Z370 EGAMING Wireless card not working

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  • I don't believe he needs to build the driver. It already exists in 18.04. It isn't loading as expected and we need to find out why.
    – chili555
    Dec 20, 2018 at 21:22

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