What do you think about Linux systems?

Question: Will 1C and other software work under Wine? This is a vital question.

Sorry. I couldn't answer earlier, even though it's a vital question.
There's a Wine build specifically designed for such tasks. Details can be found
on the developer's website. This Wine is paid, but the license is more reasonable than Microsoft's, and it doesn't seem to be very expensive.
And you can probably find a free version on the internet, although then you won't have support.

1C doesn't guarantee correct operation. That's what their developers say.

However, it works. Apparently, you didn't get the "right" developers who say that.
If you want, you can check it out here. This once again proves that you can make anything work on anything. The question is whether it's worthwhile.

That's bad =\ I'll have to remove Ubuntu from my laptop and install Windows.

Why be so categorical?). You can check out the link above. Besides, you don't necessarily have to "remove" it, even if that solution doesn't suit you - just do a dual boot ;).
And there are other solutions, like a virtual machine - I, for example, use the free Sun VirtualBox for work. A lightweight version of Windows runs much better on it than on the hardware)). It works for me - I even test heavy Java applications. So I think it will definitely handle 1C. Such a Windows with 1C on board will use no more than 200-300 MB of RAM, which is negligible by modern standards. (Let's remember Vista, which wasn't exactly a success :D).
So there are always solutions. ;)