OK, upgrading to Linux Mint 20.3 - see you on the other side, assuming all goes well.
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Fun fact, apparently when in stalling Mint 20.3 the updater also gets updated, and it doesn't like being changed while it's running.
At least as near as I can tell from the very scary messages it gave me just before it said "OK everything's fine go ahead and reboot."
I don't know most of the changes that happened under the hood but my stylus works now and so does streaming games via Steam, so I like this.