Ubuntu is a popular flavor of Linux, a PC operating system.  The good thing about Linux is it's free, and has plenty of free software that's almost, though not quite, as good as the fancy store-bought (or pirated) Windows counterpart. It's also much easier to tinker with, since it's [mostly] open source.
OTOH, it's unlikely that you are a tinkerer if you don't own a computer, and most pretty much all computers come with Windows pre-installed when you buy them.
If it matters, less than 2% of laptops/desktops use Linux (so ~1 in 100 computers runs Ubuntu).

So I'd say brave the outside & buy yourself a cheap new laptop if you have the money, cheap used crappy laptop if you don't, and a cheap desktop (remember, you also need to buy a monitor [screen, display], mouse & keyboard & a cheap wifi adapter for that) if really broke.
Plus side: Life will become 100% better.