Ubuntu Server 20.04

Embedded Linux Discussions
10

That was done here:

sudo tar xfvp ./*-*-*-armhf-*/armhf-rootfs-*.tar -C /media/rootfs/
sync
sudo chown root:root /media/rootfs/
sudo chmod 755 /media/rootfs/

You did that here:

sudo mkdir -p /media/rootfs/
  
for: DISK=/dev/mmcblkX
sudo mount ${DISK}p1 /media/rootfs/
  
for: DISK=/dev/sdX
sudo mount ${DISK}1 /media/rootfs/