My Ubuntu was complaining that it couldn't upgrade the snap-store.
However you can do "sudo pkill snap-store ; sudo snap refresh snap-store" in the shell, and all will be well.
@mrdoornbos are there any news on your VIC reproduction efforts? I saw that earlier this year and was very impressed.
My solution for day 6 of #adventofcode written in #clojure:
This was an extremely short exercise. I guess I could have even skipped the inner sanity check, for if I am running out of data to check, as the puzzle data is guaranteed to have a solution.