A quick duck of this brings up this issue: FATAL:gpu_data_manager_impl_private. · Issue #1628 · iotaledger/firefly · GitHub. Looks like it’s an electron bug you can work around by either disabling hardware acceleration or using --disable-gpu-sandbox or --ignore-gpu-blacklist. I’d report it to the upstream of that application, though I imagine there’s not much they can do either, and I guess that it’s already been reported to electron.
These errors are benign, assuming you don’t have a keychain provider. It doesn’t break any actual functionality, it just means you need to manage storing your secrets yourself. If you want to use a keychain provider, use something like gnome.seahorse or libsForQt5.kwallet, or just use KDE/GNOME outright.