mount squashfs image on ubuntu

sudo mount -o loop -t squashfs ./root.squashfs ./mnt

apt clean

sudo rm /var/lib/apt/lists/*
sudo rm /var/cache/apt/*.bin

sudo apt update

VirtualBox clone / resize

/Users/peteroh/VirtualBox VMs/Ubuntu-16.04/Ubuntu-16.04.vdi

VBoxManage clonehd Ubuntu-16.04.vdi Ubuntu-16.04-2.vdi --format VDI --variant Standard

VBoxManage modifyhd Ubuntu-16.04.vdi --resize 50000