I am using a Lubuntu live usb as kind of mobile or rescue system. It's installed on a ~4GB Stick.
Now that I wanted to update the software (aptitude full-upgrade), I ran into some "disk full" errors. Deleting the apt package cache, I was still able to finish the update. But df -h tells me, that the root fs is 95% full.
Yet the USB stick itself is only 50% full. It seems to use overlayFS and not some traditional Partition mounted with fstab setup.
Any ideas how I can extend the space used?