sudo grub2-mkconfig
sudo update-grub2
sudo grub2-install
After purposely breaking my grub config, these commands fixed it.
For deadbeef, lib64flac is the 64bit library package that it is asking for which should already be installed. I think we can ask someone to do a rebuild with that marked as the dependency.
I still don’t know what insync is so I can’t help there.
I don’t use rufus, but for ventoy you can read here for how to get around that issue: How to use Ventoy to install OMLx