Take screenshot of terminal output in text mode in Ubuntu
Use fbcat to take screenshots in ubuntu in text mode
Here's how you can take a screenshot of the terminal output in text mode in Ubuntu.
1. Open a terminal window.
2. Type in the following command then hit Enter.
sudo apt-get install fbcat
3. Take a screenshot using this command:
sudo fbcat > image.ppm
For more, see the original article at the link below.