Comment 8 for bug 1828500

I can confirm this bug is still present in the optimised 18.04.2 image, and also verify that the commands from post #5 above worked for me to fix it. I actually had to purge snapd twice, as the first time it failed due to being unable to delete a folder with `rm` since it was a folder, not a file. `sudo rm -r /var/cache/snapd/aux` fixed it for me, and then the second purge completed properly. I had no issues after that with reinstalling snap or the core snap package, or a subsequent dist-upgrade, which had failed completely on a previous spinup of the 18.04.2 LTS image.