Ubuntu 20.04 update significantly slower when Linux/ grub package is updated

Your process is working well. There is nothing wrong with it at all. The only way to make this stuff faster is to try this article on overclocking ubuntu, but make sure that you have a good cooling system. I wouldn't do it though because it is not really needed... unless you actually want that. https://wiki.ubuntu.com/OverclockingCpu Another trick that speeds up installs is a faster memory device; 120 mb/seconds or more works well. If you have a spinning style hard drive, especially an older one, it will be terribly slow on any install and will probably be slower in a general sense.