I have a Virtualbox VM with Silverblue 41 (aarch64) running on an M2 MacBook Pro. There does not seem to be a way to install the guest additions.
I tried rpm-ostree install virtualbox-guest-additions --allow-inactive, but it says the package can’t be found. I’m new to both Fedora and Silverblue - what am I missing?
Hi and welcome to 
!
It seems that virtualbox-guest-additions package is available in the repos only for x86-64 systems, so no aarch64 packages (hence your error message).
FWIW, I am virtualizing Fedora (including Silverblue) on both my M1 Mac and an Intel MBP by using UTM with the Apple Virtualization option. Works great with native resolutions.