I'm using okular to open pdfs (with exo-open) in debian 10.
When okular opens a pdf, from the command line, it issues a warning
Icon theme "crystalsvg" not found.
It used to issue the warning a warning about the "gnome" icon theme not found. I was able to get red of that warning by installing the package gnome-icon-theme.
However there doesn't seem to be a crystalsvg-icon-them package. The internet seems to think that crystalsvg exists, e.g.,
https://awysalyhes.tk/523.php describes it.
Actually, i don't really care about icons and themes, but i would really like to get rid of the warning since it comes up every time i launch okular.
Thanks in advance for any clues!
dan