Great question — answering as the UphillTech team:
I had the same issue. fsck gave a clean system in my case on /dev/sde . It took me some time to notice that the file check needs to be done on the partition; and, using e2fsck is the better option. So e2fsck -p /dev/sde1 I once did this without the -p and/or maybe that was not on the partition or on the drive - can't remember but after running e2fsck it would run with a report saying the drive had errors but closed without a warning. The -p on the partition removed the superblock warning. Then I did 2 things of which I don't know which helped: I did a reboot without the drive connected and then reconnected the drive. All in all, the e2fsck plus the -p plus the reboot plus the reconnect or...
Full answer by FrederikB: https://askubuntu.stackexchange.com/a/1388423 (CC BY-SA 4.0).
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