This quick tip shows you how to set custom color or emblem of a folder in Ubuntu 18.04 Nautilus file browser.
For those who want to have a different look and feel on folder icons,
folder-color extension allows to change the color or emblem of selected folder in the default Nautilus file browser.
1. Open terminal (Ctrl+Alt+T) and run command to install the
sudo apt-get update && sudo apt-get install folder-color
Input your password (no visual feedback while typing due to security reason) when it prompts and hit Enter.
2. Then re-open Nautilus (Files) file browser, and right-click on a folder. You’ll be able to choose a color or emblem, or set a custom color of the folder.
Note that if you don’t see the context menu “Folder’s color”, quit Nautilus via command
nautilus -q and open the Files again.