I installed plasma 5.3 on my ubuntu machine and I am encountering a strange problem. Some application icons are just not displayed: this happens only with kde, while with other DE (unity, gnome and gnome fallback) icons are properly displayed.

Even with .desktop entries that were created by me, there is no icon shown.

enter image description here enter image description here

As you can see, in the second image no icon is displayed for "Mail", even though on the desktop the launcher is properly displayed.

How could I solve this issue?

This is the .desktop file for "Mail"

#!/usr/bin/env xdg-open
[Desktop Entry]
Comment=Webapp for outlook.com
Exec=qmlscene /Applications/Mail/Main.qml

But anyways, this doesn't happen only with my custom .desktop entries, as you can see

  • Do your .desktop files validate with desktop-file-validate? And does running sudo update-desktop-database help at all? (I'm assuming not, because I've got exactly the same trouble and those things don't help!)
    – Sam Wilson
    Aug 2 '16 at 3:26
  • in systemsettings -> icons
  • Select Breeze
  • systemssettings -> application style -> graphic components -> icons
  • Select Breeze
  • systemssettings -> application style -> gnome application style(GTK)
  • Select Icon theme = Breeze
  • Fallback theme (IMPORTANT) = Oxygen
  • restart

References: here

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