Sudo unsquashfs -f -d unsquashfs/ rootfs/casper/filesystem.squashfs Now that we know where the filesystem.squashfs file is, we can extract the necessary filesystem files from the rootfs directory into the unsquashfs directory with the commands: cd ~/
On the Ubuntu server ISO, that file should be located in the casper directory.
To do that, change into the rootfs directory with the command: cd ~/rootfs We need to locate the directory housing the filesystem.squashfs file. The above command will mount the image as read-only, so you can ignore the warning. To mount the ISO image into the rootfs folder, issue the command: sudo mount -o loop ~/Downloads/ ~/rootfs Before you mount the ISO, create two new folders with the command: mkdir rootfs unsquashfs I'll demonstrate with the Ubuntu Server 20.04 ISO. Now we need to mount the ISO you downloaded (or created yourself). Make the system aware of the new group addition with the command: newgrp docker How to mount the ISO Once Docker is installed, start and enable the service with the commands: sudo systemctl start dockerĪdd your user to the Docker group with the command: sudo usermod -aG docker $USER To install Docker on your machine, go back to the terminal and issue the command: sudo apt-get install docker.io -y
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