How can I change the icon of an application in the Unity launcher?

The first thing you would need to do is take a .png icon file that you would like to use and copy it to the respective ~/.local/share/icons/hicolor/ directory. This will contain the following directories (which are the dimensions of the icons) : 16×16/apps/ 32×32/apps/ 48×48/apps/

I downloaded a free 16×16 free icon sampler and picked a 16×16 icon called Alien.png

I took the Alien.png file and copied it to ~/.local/share/icons/hicolor/16×16/apps, When you copy yours, you can do that through either the GUI or terminal.

From there you would need do the following in a terminal (you may need sudo to copy this over):

Next edit the pidgin.desktop file:

Look for the line that says:

This will need to change to the new icon name without the .png prefix…

Save your changes… Then logout and log back in.

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