no thumbnails in ristretto

[slumbergod]

I have ristretto set as my default image view in Xubuntu 18.04. I have the thumbnail took bar enabled. Unfortunately, all the thumbnails show error images. I can only see the thumbnail for the currently viewed image. When I use the next arrow to go to the next image, the previously viewable thumbnail changes to the error image and only the thumbnail for the newly viewed image is seen.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ristretto 0.8.2-1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
Date: Tue May 1 17:06:38 2018
InstallationDate: Installed on 2018-04-27 (4 days ago)
InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: ristretto
UpgradeStatus: No upgrade log present (probably fresh install)

[slumbergod (slumbergod)]

Ok, solution was to delete everything from:
~/.thumbnails
~/.cache/thumbnails

After the reboot thumbnails were present in thunar and ristretto.
Also the problem with the desktop wallpaper changer seemed to be working too.

[slumbergod (slumbergod)]

The solution is only temporary. Ristretto shows placeholder images for all images it is previewing with thumbnails.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[slumbergod (slumbergod)]

Just did a clean install of 18.04.1
Ristretto still doesn't show thumbnails in the side bar.