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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?

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