No option to select WI-FI [duplicate]

Solution 1:

The Mediatek 7921 is recognized in kernel versions 5.12 and newer. With a working internet connection by ethernet, tethering or whatever means possible, open a terminal and do:

wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.12.5/amd64/linux-headers-5.12.5-051205-generic_5.12.5-051205.202105190541_amd64.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.12.5/amd64/linux-headers-5.12.5-051205_5.12.5-051205.202105190541_all.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.12.5/amd64/linux-image-unsigned-5.12.5-051205-generic_5.12.5-051205.202105190541_amd64.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.12.5/amd64/linux-modules-5.12.5-051205-generic_5.12.5-051205.202105190541_amd64.deb
sudo dpkg -i linux*.deb

Reboot and your wireless should now be working. You may need to disable Secure Boot in the BIOS/EFI.