Is it good to install Windows after or before Ubuntu? [closed]

The solution is already pointed out, I just want to sum up everything:

When running a dual boot environment, a boot loader has to show you the operating systems installed and let you select which one you want to boot. The Ubuntu boot loader, GRUB, is capable of doing this, while the one of Windows is not.

Therefore, it is easier to first install Windows und Ubuntu afterwards. The Ubuntu installer will offer you to install Ubuntu beside Windows and will take care of everything. It's easy and the standard procedure.

Nevertheless, the other way round is possible, too. But the Windows bootloader will override GRUB. Because of that you'll have to reinstall GRUB. This can for example be achieved by booting a live system and running boot-repair.

If you want to keep both in dual boot you should install first Windows then Ubuntu because if you do it reverse Windows boot loader with erase Grub boot loader and then you need to reinstall to get access to Ubuntu.