I get this error for Mangohud. I recently uninstalled and installed heroic to the latest version. I installed mangohud from software manager and that worked well for the previous version of Heroic. I uninstalled Mangohud from software manager and reinstalled it again but that didnt fix the problem. I saw some people have opened ticket with the same issue and I saw a command - flatpak --user install flathub runtime/org.freedesktop.Platform.VulkanLayer.MangoHud/x86_64/25.08 . This didnt work for me and I got the error - error: No remote refs found for ‘flathub’. I use Linux Mint. Any help is appreciated