Building my own version of OctoPrint with a few plugins when the build command is issued and it appears to go all the way through building the necessary modules and ripping apart the image, only to fail rebuilding the image.

Using Ubuntu 19.04 (64-bit) in a VirtualBox VM from osboxes.org. Simply using 'terminal' and not trying to install in Docker or with Vagrant.

build.log

I am pretty sure it is a permissions issue, but can't figure out how to fix it, sorry I am a linux noob.

A couple of notes, 'realpath' is not in the current Ubuntu package repository so it cannot be installed, also 'curl' needed be added to the install list in order to download the source via the provided instructions. Also, loop is not built into the kernel and not a loadable module so 'modprobe loop' does nothing. Nor does it list loop when searching for modules with 'lsmod'.

I studied the four other issues that mention loop failing (2 closed, 2 open) and it does not appear to provide a clear understanding of what is going on.

Just to verify if my setup of OctoPrint was the culprit, I tried building AlarmPi and OctoPi and both failed at the same location.