I have no idea why this seems to plague me! After the last time this happened (Can't make snapshots (again)) I launched a new instance, assuming it would be free of any issues the old one had. I’ve just installed a bunch of stuff on it and want to make a snapshot so I can launch a couple of group servers with everything already installed rather than spend time making two “identical” servers, but alas no:
I restarted it in case that was the issue but same thing.
Installer V2, hosted at Warwick running ubuntu 16.04