adwaita icon them not found

Likewise, I get

$ okular
Icon theme "adwaita" not found.
Icon theme "adwaita" not found.

(on Xubuntu).

yep, i'm sure it's not application related but something wrong in xubuntu. that's why i originally set it to Ubuntu... But Paul change it.

Status changed to 'Confirmed' because the bug affects multiple users.

It's not only `kphotoalbum` and `okular`. It's all KDE apps in XFCE that suffer the problem.

Change to adwaita-icon-theme because it affect all KDE apps on latest LTS xubuntu.
Please provide help

Hi all,
I finally found a part of the problem.
In the file /usr/share/icons/elementary-xfce/index.theme
There's the line :
Inherits=adwaita,gnome,hicolor

if it's replaced by (notice a to A change in adwaita)
Inherits=Adwaita,gnome,hicolor

That's because the directory of Adwaita had a "A" not a "a"

kphotoalbum do not complain any more.
So part of the problem is on elementary-xfce theme

however, icons are still not displayed for "Events", "Media Type", "Geolocalisation", and some other in settings menu...

To be continued.. any idea welcome

If the Inherits line in index.theme is changed to
Inherits=Adwaita,gnome,hicolor,breeze

then kphotoalbum looks better but there's still some missing icons.

is there a way to check that all icons are available in a theme ?

I agree, that the issue is about small "a" and capital "A". This fixes the problem for me:
>sudo ln -s /usr/share/icons/Adwaita /usr/share/icons/adwaita

Maybe, also this works (But as I'm not sure, if there are also programs, which look for Adwaita with a capital "A", I thought having a softlink would be the safest way):
sudo mv /usr/share/icons/Adwaita /usr/share/icons/adwaita

This was fixed upstream.

https://github.com/shimmerproject/elementary-xfce/commit/25ff77b020be948e6ad8fed783aaa87c1184d839

This bug was fixed in the package elementary-xfce - 0.13.1-1ubuntu1

---------------
elementary-xfce (0.13.1-1ubuntu1) disco; urgency=medium

  * d/patches/adwaita-icon-theme.patch:
    - Correctly inherit Adwaita icon theme (LP: #1787989)

 -- Sean Davis <email address hidden> Sat, 30 Mar 2019 21:28:52 -0400

Should the capitalization of Adwaita not also be fixed for Ubuntu 18.04 (bionic) in package xubuntu-icon-theme file /usr/share/icons/elementary-xfce/index.theme which still says

  Inherits=adwaita,gnome,hicolor

even though /usr/share/icons/Adwaita has a capital A?

Yes it is required on 18.04 but the better way should be to change the adwaita package so that it is lowercase like all other font package.

I'm still looking for the right solution.
It seams that playing with this

> sudo apt install qt5ct qt5-style-plugins

Then add in your .bashrc
export QT_QPA_PLATFORMTHEME=qt5ct

has change them also has an impact.
So i think that there is a missing icon theme but which one ?

The following 2 pictures show kphotoalbum with fusion ou breeze theme choosed by qt5ct

I'm definitly lost and not able to find a correect configuration of thene in order to have all icons in kde apps on xfce...
Anyone...any idea ?

hi all,
I finally manage to get all icons on kphotoalbum on xfce.
there's 2 solutions and i don't know which one is the good one.

first elementary theme need to be fixed.
In the file /usr/share/icons/elementary-xfce/index.theme
replace
  Inherits=adwaita,gnome,hicolor
by (notice a to A change in adwaita)
  Inherits=Adwaita,gnome,hicolor

Then to have all icons on kphotoalbum, i need to add other icon theme to the line which ended as :
Inherits=Adwaita,gnome,hicolor,breeze,oxygen,default.kde4,default

Why is this needed, would you ask me.
I've got 2 answers :
a/ the icon fallback mecanism of KDE do not work properly on xubuntu. (Still don't know why)
b/ kphotoalbum.desktop use a line
Icon=kphotoalbum
and this do not exist !! (is this a bug of kphotoalbum or those this application rely too much on the icon's fallback mecanism of KDE ? (not sure at that time).

because it works with all kde apps and all users, i will stay on the workaround that fix /usr/share/icons/elementary-xfce/index.theme but i'm sure that this is not the right answer.

I've solved my problem and i stop research now.
It's up to someone else to finalize it.

I hope that this workarounf could help other people.
bye all.