I have thumbnails, but no previews on desktop and and none in dolphin. Via muon, all thumbnail related apps and libraries are installed. In dolphin, the preview button in menu does nothing. Can anybody find a solution? Thanks.

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  • Have you run sudo apt update and sudo apt full-upgrade recently? Do both these commands run without any error messages or warnings? Also, please run cd $HOME && find . ! -user $USER -ls. The command will take a while to complete. Do you get many hits or do you just get back your terminal prompt? – DK Bose Jan 16 '20 at 3:56
  • Also, please clarify what you mean by "I have thumbnails". Can you add a screenshot showing where you see thumbnails and where you don't? – DK Bose Jan 16 '20 at 4:00
  • @ DK Bose. Hi. Many thanks for reply. Excuse, I have been away. 1/ No errors or warnings for updates. 2/ The command "cd $HOME..." brings error " find: paths must precede expression: `=-user' " 3/ I have icons showing on desktop and dolphin. no preview. – rob grune Jan 24 '20 at 6:04
  • cd $HOME && find . ! -user $USER -ls works for me. Please try again exactly as shown. – DK Bose Jan 24 '20 at 6:08
  • 4/ The original post is edited to show how the icons appear in dolphin and desktop. [excuse size. know not how to reduce]. -regards. – rob grune Jan 24 '20 at 6:10

Out of frustration, re-installed Kubuntu, minimal manual. Problem solved. [no pain, no gain]. Thanks to all.

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