How can I show the week numbers in the calendar shown at the top in GNOME Shell?

I would like to display the week numbers in the calendar that is shown in Ubuntu with GNOME shell v3.26 when clicking on the date in bar at the top of the screen.

If you have dconf Editor, launch it and navigate to /org/gnome/desktop/calendar/show-weekdate. Then disable Use default value and set Custom value to True.

Alternatively just open Terminal and run

gsettings set org.gnome.desktop.calendar show-weekdate true

You can do that with the GNOME Tweak Tool.

sudo apt update
sudo apt install gnome-tweak-tool

Open the application after installing it.

1. Go to the "Top Bar" menu item from left.

   

2. There's an option called "Show week numbers". Check it.