Hints for showfoto in xenial
showfoto/4:4.12.0-0ubuntu7: showfoto.desktop ⚙ amd64
Warnings
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screenshot-read-error
Error while reading screenshot data for 'https://userbase.kde.org/images.userbase/thumb/5/5d/PhotoTut1_2.png/550px-PhotoTut1_2.png' of component 'showfoto.desktop': cannot identify image file
Maybe the server returned an invalid image (e.g. an error page), or the image data is broken.