I am unable to change the desktop icon. i tried using tweaks software but desktop icon is not changing in ubuntu 20.04. its always black and white icon. please help.
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I had the same problem with some custom icons packs, I guess that the ones that you chose have not desktop icons implemented.
So I recommend you to try, for example, Numix:
sudo apt install numix-icon-theme and try now to switch to it. This should change your desktop icons.
From now on, you can choose another custom icons, and if that package does not have desktop icons, you'll keep Numix ones.
gnome-shell-extensions to change the appearance using gnome-tweaks:
sudo apt install gnome-tweak-tool sudo apt install gnome-shell-extensions
Then set the Yaru theme as the default:
Here is a screenshot of the correct settings.