Does it have problems? I mean, some may prefer other distros to Ubuntu or may not like some stuff that come with Ubuntu, that doesn't mean Ubuntu has any issue ;)

I don't like bananas, no issue at all with bananas. I prefer Debian (on which is based Ubuntu) and I prefer Mint (based on... ubuntu) because they suit me much better, that's all. At least for me. edit: one thing I don't like for example are snaps, me not liking them does not mean they're necessarily bad.

For me: not Gentoo.

Generally I recommend OpenSUSE Thumbleweed or Slowroll.

As well as what has already been mentioned, when I used it, it crashed a lot.

I guess it is different reasons for different people. But for me, I started using ubuntu in 2005. When I was learning linux, it was just not complete enough. You install another DE/WM, to try it out, and stuff started to break. So I switched pretty quickly. I tried to return every now and then, because it had an environment of newer packages which I waned/needed. But it was never worth it, this or that always broke when you tried to do something peculiar. I use ubuntu every now and then, but it is mostly no good. The issue is really just snap. Snap firefox on rpi, which is the default, is just trash and unusable. It is crazy that they made it the default. I have also had servers where snap-services just eats too much cpu and first thing I have to do is to purge it. So, in summary, I don't really trust them to provide a reliable system, and I am sceptical of their direction.

to me none!! i like ubuntu a lot and specially xubuntu

The name. Sounds dumb.

I use arch, btw

it has a gui installer (i use arch btw)