You shouldn't need to download any graphics drivers, Ubuntu (and pretty much every other distribution) ships with the open-source AMD driver stack by default, which are significantly better than and less hassle than the proprietary drivers for pretty much all purposes. If you're getting video out it's almost certainly already using the internal GPU, but if you're unsure you can open a terminal and run sudo apt install mesa-utils and then glxinfo -B to double-check what is being used for rendering.

I have the same device and have had no issues with drivers or games. I also wiped Win 11 and have Linux on there.

I started with Nobara and it worked immediately and been running with that for nearly 18 months. I have recently (as in this week) switched to OpenSuSE after my Nobara install had issues, and again gaming is fine.

I'm not sure about Mint or Kubuntu but I can't see why either would have issues. The drivers should be within the kernel; I haven't needed separate drivers. I used KDE on both Nobara and on OpenSUSE without issue.

As you've experienced, I been impressed with the level the graphics can get to. Largely medium settings at 1080p for many games. I have played Cyberpunk 2077 on this on a mix of low to medium settings.

This may be too basic question but you're not playing games at 4k are you? The desktop can be at 4k but the games need to be set to less. You should be able to play 3D games on it, and I'd expect Yakuza Zero to play fine. The device is good with a 4k desktop and 4k video, but 4k 3D games is way more of an ask and you need to bring games down to 1080 (or even 720p if you want to push up some of the other game options).

EDIT: BTW if you have a gaming desktop you can stream games to this miniPC in 4k. I switched to playing Cyperpunk via steam streaming and it looked incredible.

EDIT2: One thing that is generally important is to install gstreamer and available codecs. They categorise them as "Good", "Bad" and "Ugly". Often the "good" category codecs are installed but sometimes the more proprietary codes in the "ugly" category are not (they are "Ugly" due to their licenses but are still excellent quality). I don't believe it makes a difference to gaming but I certainly noticed issues with video. OpenSuSE doesn't install proprietary codecs by default. Nobara did (I think) but I'm not sure about Mint and Kubuntu's approachs.

EDIT 3: Just wanted to highlight another important point mentioned elsewhere in this thread by just_another_person@lemmy.world. KDE defaults to balanced power mode for me and that certainly does impact the GPU performance. You need to change it to Performance mode in the power settings. That can either be done from the "Power and Battery" area in the task tray or in the "Power Management" section of the KDE Settings app (near the bottom of the list in the "System" group).

Are you running games via Flatpaks and have not given the Flatpak permission to use GPU acceleration? That has severly slowed down games on my similar AMD-based Minisforum PC. If you are, you can use Flatseal to easily adjust settings.

If it's running an AMD APU, you need to make sure that your power profile is set to "Performance" and not something like "Power Saver". I know KDE has a lot of issues with power profile management since they nixed the quick settings awhile ago, but I think in your settings there is a place to choose your preferred settings. Limiting the power on those APUs significantly hampers it's ability to play games.

If you're going to be gaming, you may want to switch to a distro that does semi or rolling releases. Latest Kubuntu is still on kernel 6.8, and there are MASSIVE performance improvements between that and 6.15 which something like Fedora is running by default. That, and many updated versions of the Mesa drivers.

Do they all come with windows? I was thinking of getting the EQ14 but don't want to give Microsoft anything.

Yeah, mine was full of wasps instead