Still No wifi adapter for Realtek RTL8822BE found in 18.04

Solution 1:

I was having the same issue on a Lenovo Legion Y530 laptop, which has a Realtek rtl8822be wireless network card, with 18.10 Ubuntu MATE.

What I did to fix it was, plugging it into the network via Ethernet, I ran sudo apt-get update and sudo apt-get upgrage then, using your favorite text editor, edit blacklist.conf.

sudo -H gedit /etc/modprobe.d/blacklist.conf

I added the line:

blacklist ideapad_laptop

then saved and closed the file, and rebooted.

If you didnt want to make this change, without testing it, you could do this:

sudo rmmod ideapad_laptop

Doing this gave me instant results. Wireless networks appeared, I was able to connect, and life was great again. I have no idea if your setup will have an IdeaPad module, but you might try it. Alternatively, you might have an HP module that needs blocking to enable this device.