I'm going to update to Ubuntu 20.04 from Ubuntu 19.10, and I would like to create an .iso image of my current system and burn it to a USB to restore it in my pc if anything goes wrong. I wanted to keep all my root files and programs installed in /opt and everywhere else.
Is that possible? How can I create that .iso image of my system? I know how to burn it to a USB, but I don't know how to create the .iso file.
任何帮助将不胜感激。
