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Download the image file for Ubuntu Server from from http://cdimage.ubuntu.com/ubuntu/releases/18.04.3bionic/release/ubuntu-18.04.35-preinstalled-server-arm64+raspi3.img.xz,   then insert your microSD card into your computer so that you can flash the disk image onto it. If you are running Ubuntu or any other Linux distro, you can flash the image using this command:

xzcat ubuntu-18.04.35-preinstalled-server-arm64+raspi3.img.xz | sudo dd bs=32M of=/dev/mmcblk0 iflag=fullblock oflag=direct status=progress; sync

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sudo touch /var/swap
sudo chmod 600 /var/swap
sudo dd if=/dev/zero of=/var/swap bs=1M count=2048
sudo mkswap /var/swap 
sudo swapon /var/swap
sudo sh -c "echo " /var/swap swap swap defaults 0 0 >> /etc/fstab"

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