My system was upgraded from 18.10 to 19.04, then to 19.10 and finally to 20.04. I have been using it for more than 15 months as my primary computer. This is a typical default Ubuntu installation with some extra manual "apt install"s.
I noticed that there are a lot of fonts and font variations (mostly Asian) that I haven't installed explicitly. Selecting a font in an application (e.g. in LibreOffice) is cumbersome because of the long font drop-down list box. Also, I think that having so many unneeded fonts will make applications slower and is a waste of system resources.
I would like to remove most of the seemingly unnecessary fonts from my system. However, I am not sure which ones are necessary for proper system and core applications operation. Are there any pointers on how to decide on this?