1) Ubuntu
Tried two versions. Both failed.
2) Lubuntu
Installed, much faster as compared to Windows 7 and 10. But with many bugs (no sound, etc.) and had to solve one by one.
3) Debian
Installation seemed successful but "no operating system is found" when restart.
4) Chromium
Extremely easy to install, no bugs, but slightly slower than Lubuntu, still faster than Windows 7 and 10.