Maggoo
Hello,
my machine is also not the newest. Nevertheless, you should keep the operating system up-to-date. It is more than likely that graphical stuff in 2020 does not really fit a modern operating system, besides there are no updates for 5 year old OS (even Ubuntu LTS does not do that). For example, Ubuntu switched to wayland, that did not exist 5 years ago. I still don't understand, also every other software package in Caelinux made substantial progress in the last 5 years. I don't know what you need in there, but FreeCAD is better than ever, 1.1 will come soon. OpenFOAM is updating every 6 months and is way better and faster than in 2020 etc. Modern software packages come containerized to circumvent installation hassle etc. Maybe it is time for an update... ?
Mario.