It's not a duplicate, I would say that its because in your desktop file, you have: Icon=/usr/share/byobu/pixmaps/byobu.svg instead of an icon name and the desktop file parser don't pick it, will have a look.
It's not a duplicate, I would say that its because in your desktop file, you have: share/byobu/ pixmaps/ byobu.svg
Icon=/usr/
instead of an icon name and the desktop file parser don't pick it, will have a look.