I did find a solution suggested here:
https://userbase.kde.org/Umbrello/FAQ/en#Why_don.27t_I_have_any_icons_on_the_toolbar_.3F
So I added to my .profile file:
KDEDIRS=/usr/share/umbrello export KDEDIRS XDG_DATA_DIRS=$XDG_DATA_DIRS:/usr/share/umbrello export XDG_DATA_DIRS
I then logged out and logged back in. Still no icons.
I did find a solution suggested here:
https:/ /userbase. kde.org/ Umbrello/ FAQ/en# Why_don. 27t_I_have_ any_icons_ on_the_ toolbar_ .3F
So I added to my .profile file:
KDEDIRS= /usr/share/ umbrello DIRS=$XDG_ DATA_DIRS: /usr/share/ umbrello
export KDEDIRS
XDG_DATA_
export XDG_DATA_DIRS
I then logged out and logged back in. Still no icons.