Can't run ./launcher rebuild app - Docker storage driver is unsupported

I’ve just done a git pull on the /var/discourse directory of my host, and am now getting warnings about using devicemapper. I followed the basic install instructions for digital ocean when I set it up last year, and haven’t messed with any docker settings.

What’s the best way to proceed? Should I be trying to change the storage driver, or starting up a new droplet and restoring a backup?

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