This might be of help:
To make sure the workaround is still working, I’ve just run a test in a VM: fresh install of Silverblue on the same disk as another OS. These are roughly the steps to be taken: Make unallocated free space available on the existing drive for the new OS, using the available tooling (e.g. Fedora Workstation ISO booted into a live environment)[1]; Boot the Fedora Silverblue (or another Fedora Atomic) installation media; In the Installation Destination window, select the Custom option for Storage C…