I frequently use screen capture to record the steps in using software. The best tool for doing this is Shutter. So I make it available every time my Ubuntu 20.04 starts.
Step 1: Open Startup Applications
From the left corner button, click Show Applications
then select Startup Applications
Step 2: Add shutter in startup list
Shutter should be listed in the startup program by adding the command.
For the name field, type: shutter
For the command field, type: shutter --min_at_startup
the click Save button.
Step 3: Restart Ubuntu
To make Shutter runs on startup, then restart the machine and you can see the shutter icon. Shutter is now ready to use.
and enjoy using Shutter.