https://forums.linuxmint.com/viewtopic.php?t=330714
sudo apt install git dkms git clone https://github.com/aircrack-ng/rtl8812au.git cd rtl8812au sudo ./dkms-install.sh
sudo apt install /media/flashDriveName/package.deb.
Installing packages from live CD:
mount /dev/nvme0n1p7 /mnt mount --bind /dev /mnt/dev mount --bind /sys /mnt/sys mount --bind /proc /mnt/proc mount --bind /run /mnt/run # if needed, as noted above chroot /mnt apt install gnucash # or whatever you need
then
update apt install dkms apt install make apt install make-guile
The update stage complains of some online access but will otherwise