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H1_SD is the name of a MicroSD card I'm connecting, it does connect a second later, but it's annoying to keep dismissing this error every time. I am also getting it with regular SD cards and USB Drives regardless on which USB Port I've connected it to, and which format it's been partitioned too. NTFS, exfat, fat all respond similarly.
EDIT Welp, I was able to brute force a "fix". There appeared to be an issue with the Nemo configuration between 21 and 22. Not sure what the issue was specifically, but deleting the users ~/.config/nemo and a reboot fixed it for me.
That was my guess too, and if Nautilus has the auto mount disabled the error goes away. But I'd like for USB drives to be auto mounted. And lsof just gives a wall of indecipherable text. What would I be looking for?
grep the mount point and track down the pid that using that file. should be pretty easy to see which application is doing it.