Am 08.12.20 um 20:39 schrieb Josh Jones:
Amazing, that has taught me something very useful!shutdown-log.txt attached and error is visible!
Thanks.So from a quick glance it seems fwupd keeps your / busy and prevents it from being remounted ro.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=953679 looks relatedIf you don't have a system/BIOS vendor supported by fwupd, you might consider purging the package to verify that the problem is solved.
Michael