I would say you are already secure enough if you are using software from official/trusted repositories and updating them on a regular basis.
That said, if you want extra security. Drop all software that cannot run on Wayland and go even further by isolating all desktop applications with the Flatpak sandbox. This is made extremely easy with Flatseal. Maximum points if you setup secure boot.
to use as a media centre and multiplayer gaming system in my living room
Based on this, you’re basically looking for the ‘game console experience on your couch’. If that’s the case, honestly you shouldn’t look beyond^[1]^ Bazzite.
If, instead, you actually wanted to play retro games primarily, then please let us know.
While ChimeraOS and HoloISO also offer the ‘game console experience’, they don’t support Nvidia GPUs. So you would be on your own at best; which would be a horrible experience for a new user. If you feel particularly adventurous, then Jovian-NixOS is actually another option. But arguably less newbie-friendly compared to Bazzite.
I’d definitely like to get some of the classic multiplayer games running on emulators as well.
Bazzite does allow easy install of EmuDeck and RetroDECK during first installation, which should cover most of your emulation needs. For completeness’ sake; Batocera does exist. However, I’m not sure if it runs e.g. Steam games as good as Bazzite runs retro games.
HoloISO is SteamOS for non Steam Decks. That would be great option for something that “just works” and is designed for use from the couch with a controller. I haven’t tried this but I’m sure there’s a way to install Kodi for media too.
I don’t really know, other than the other 2 are updated on a nearly daily basis and Chimera is Arch-based (like SteamOS) with Gnome UI while Bazzite is Fedora-based.
Yeah this isn’t really much of an issue with EFI now. You can change boot order in the BIOS and things are way less likely to get overwritten or broken. You can even have 2 EFI partitions if it’s something your concerned about.
The only time I got my grub overwritten was when I have to update bios/firmware from Windows. After bios/firmware update, the update app always restore windows boot manager and I need to reinstall grub from live environment.
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