navigation panel icons missing on standard install of 17.04

[Krister Swenson]

The navigation panel has only a single icon. The icons for "Thumbnails", "Reviews" and "Bookmarks" are missing.

[Launchpad Janitor (janitor)]

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

[Dylan Justice (dsjstc)]

Still present in 17.10.

[Alessander Botti Benevides (alessanderbotti)]

As a workaround, what worked for me was:

$ sudo apt install systemsettings kde-config-gtk-style kde-config-gtk-style-preview oxygen-icon-theme

* systemsettings for the app systemsettings5;

* kde-config-gtk-style enables the Appearance module in systemsettings5;

* kde-config-gtk-style-preview allows previewing the themes without restarting the GTK applications;

* oxygen-icon-theme is an alternative theme to use in KDE applications.

Then, run systemsettings5, click on Application Style, select Oxygen as a Fallback theme, click on Apply.

[mx321 (mx321)]

The steps described in #4 did not work for me. I managed to fix it by running qt5ct and selecting "Oxygen" as icon theme there.
Rem: I also have QT_QPA_PLATFORMTHEME="qt5ct" in my env.

See https://bbs.archlinux.org/viewtopic.php?id=220907

[Krister Swenson (thekswenson)]

The workaround works for me.

[Dark Dragon (darkdragon-001)]

Still present in 18.04.

[Vincenzoml (vincenzoml)]

Still present in 20.10.

The proposed workaround works for me:

1) sudo apt install qt5ct oxygen-icon-theme

2) run qt5ct, select oxygen icon theme, apply.

[Clemens Sonnleitner (q-wertz)]

For me it worked to use the snap version.

1) sudo apt remove okular --purge
2) sudo snap install okular

[Marcel Waldvogel (marcel.waldvogel)]

In 21.04, the following works:

1) sudo apt install breeze-icon-theme

done.

@Maintainers: Please add some form of dependency on this.