Kde, Dolphin : Dolphin not showing preview of images or any files

Question

I have Ubuntu X64 running and I have installed dolphin and packages like kffmpegthumbnailer, mplayerthumbs, ffmpegthumbs mainly found here. Even after that I cannot see thumbnails. Any idea what's wrong. Check the screenshot below :

Thank you.

Answer 1

I had exactly the same issue. I used

sudo apt-get install kio-extras

and now it works well. You might need to go to

Settings>Configure Dolphin...>General>Previews

and then select whatever you need. Then of course press the "Previews" button if you haven't or go to View>Previews, but at least images should be by default. I also read that for some other formats (that I'm not using, so I haven't tested it) you should try

sudo apt-get install ffmpegthumbs

sudo apt-get install mplayerthumbs

sudo apt-get install kffmpegthumbnailer

I hope it works for you too!

Answer 2

i'm reviving this old thread because the title describes exactly my case. After updating Kubuntu from 21.10 to 22.04, I had the problem "Dolphin not showing preview of images or any files". Some times it just worked. Some times, if I reloaded [F5] the directory, I was able to see the thumbnail of the file I had selected before. But mostly, no previews.

What worked for me, was to delete/rename the /home/USER/.cache and restart Dolphin. Hope someone finds this useful :=)

EDIT: This problem keeps coming back. While dolphin is recreating the cache (i'm viewing a folder of 500 files and 20 subfolders) at some time throughs this on konsole:

libpng warning: known incorrect sRGB profile
libpng warning: profile matches sRGB but writing iCCP instead

After this, I have to re-delete the cache folder and restart.

EDIT2: Ok, I'm narrowing down a little. If I select a file, lets say a .jpg or a .txt, and scroll a little up or down, viola! the thumbnail gets refreshed and appears! At the same time on konsole:

Qt: Session management error: networkIdsList argument is NULL