A fix for unstable Wi-Fi WPA2/WPA3 connection for xubuntu 21.04

[levelel]

The latest xubuntu (21.04) works out of the box for most of the issues listed. Namely, HDMI, sound, and Wifi will work without any tweaks.

The only problem is that, Wifi disconnects and asks for password again and again quite frequently. Fortunately, I found a solution.

The reason for that problem is that WPA3 doesn't authenticate on the machine. And the system will recognize the Wifi signal as two separate ones, one for WPA2, and the other for WPA3. For example, my wifi SSID is called "my_wifi", and is mixed WPA2/WPA3 Personal. Xubuntu will connect to "my_wifi" with WPA2, but when it disconnects, it keeps trying to connect to the same SSID using WPA3 for some reason. And in this situation, the WPA3 version of the same wifi connection would appear as "my_wifi1" (notice that there is a number "1" appended") in the connection list. Xubuntu would keep asking for password when it tries to connect with WPA3 and authentication would always fail.

Solution: the solution is to disable auto-connect for the WPA3 connection. Click the connection icon in the taskbar at the top-right corner. Then click "Edit Connections", find the WPA3 connection by checking the Wi-Fi Security tab, and uncheck "Connect automatically with priority xx" in General tab.