I use a machine with Xubuntu and I installed i3 on it. When I log in in i3 and open thunar the icons are missing. I read that I have to set the icon set in xfce4-settings-manager > Appearance. The icon set is elementary Xfce darker. When I log in in Xfce it works. Why can't this icon set be loaded in i3?
Well, since xfce isn't being used the settings manager isn't either. To set an icon theme or gtk-2 theme create the following file in your /home/user: .gtkrc-2.0 . In it set the icon theme with the following line:
gtk-icon-theme-name = "elementary-xfce-darker". a gkt-2 theme would be set in the same file with
gtk-theme-name = "theme-name". The theme names need to be identical to the names in /usr/share/icons or /usr/share/themes. Using
gtk-icon-theme-name = "elementary Xfce darker" would not work.