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First, we need to install the ligature font systemwide:
sudo apt-get install fonts-firacode
Next, we need to add the following into the VS Code settings file.
Go to File->Preferences->Settings. And then search for font ligatures.
Edit the line with editor.fontLigatures to match below, and all the extra line underneath it.
{
"editor.fontLigatures": true,
"editor.fontFamily": "Fira Code"
}
Restart VS Code and your programming symbols should now be displayed as ligatures.