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After battling errors due to pango, I finally able to log in to my machine however my top toolbar icons, apps icons, and some settings icons are missing / a mess. Here are some errors :

Top toolbar, prior to this errors, both "..." icons had fine icons each for cpufreq and redshift :

Top toolbar error, prior to this errors, both "..." had fine icons each for cpufreq and redshift

Setting icon error : Some icon errors in Ubuntu settings

Apps icon error (Gimp). Gimp looks very bad, I can't use it properly : Gimp looks very bad, I can't use it properly

I came across this question Toolbar icons and menu icons are missing everywhere in Ubuntu 20.04, which could be the same problem as mine (including GIMP icons errors), but there's no answer to the question yet. Came across this question as well Folder and file icons messed up, the solution doesn't work for me.

I have gnome-tweak-tool installed with Yaru as my theme : here's my setting

According to my history log, these are packages I've tried to reinstall this past half day in an attempt to get my icons back to normal :

apt-get install --reinstall appmenu-gtk2-module appmenu-gtk3-module
apt-get install --reinstall indicator-application
apt-get install --reinstall indicator-common

apt-get remove --purge yaru-theme-icon yaru-theme-gtk yaru-theme-gnome-shell
apt-get install yaru-theme-icon
apt-get install yaru-theme-gtk
apt-get install yaru-theme-gnome-shell

Any suggestion ?

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I came across some information about libglib :

GLib provides the core application building blocks for libraries and applications written in C. It provides the core object system used in GNOME, the main loop implementation, and a large set of utility functions for strings and common data structures.

It's apparently also responsible for general-purpose like for GTK+ and GIMP (finally, explains a lot about my GIMP icon errors). I found that my system has 2 versions of Glib installed : 2.64 and 2.9. According to Ubuntu package release, the latest Glib release for 20.04 is supposed to be 2.64, therefore I purged the 2.9 version. It was installed from source, so I had to uninstall from Glib source folder using :

sudo make uninstall

Reboot, and Gimp and other apps icons + tray icons are now back to normal.
Hope it helps anyone with the same issue as mine.

GIMP

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