I have shotwell showing a lot of wrong thumbnails. Many of the photos shown in thumbnails should not be in the database any longer, since they were removed a long time ago. Clicking these thumbnails reveals that they do not refer to the picture shown, but a completely different one.
From the tags attached to the picture it is obvious that the thumbnail is wrong, not the picture attached to it.
So the question is: How could the database get into that state, where pictures in the library have wrong thumbnails (showing pictures long ago removed). This state is very disturbing. How can it be fixed?
ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: shotwell 0.22.0+git20160108.r1.f2fb1f7-0ubuntu2
ProcVersionSignature: Ubuntu 4.8.0-26.28-generic 4.8.0
Uname: Linux 4.8.0-26-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Nov 6 18:35:41 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-12-13 (329 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: shotwell
UpgradeStatus: Upgraded to yakkety on 2016-10-13 (23 days ago)
Status changed to 'Confirmed' because the bug affects multiple users.