Hi, just like to chime in that I'm also affected by this bug. I upgraded from Bookworm to Sid about a week ago, and virtualbox stopped working after that point. I re-installed virtualbox through the package in Sid instead of through Oracle's deb repo, and it still doesn't work.
the error I have is a bit different: > VirtualBox can't operate in VMX root mode. Please disable the KVM kernel > extension, recompile your kernel and reboot (VERR_VMX_IN_VMX_ROOT_MODE). > Result Code: > > NS_ERROR_FAILURE (0X80004005) > > Component: > > ConsoleWrap > > Interface: > > IConsole {6ac83d89-6ee7-4e33-8ae6-b257b2e81be8} > I am running kernel 6.12.6-amd64, and my user is part of the vboxusers group. This is my first time here on the bug tracker, so if anyone wants to ask for more system specs info from me that could be useful, I'll do so; I don't know exactly what info I should provide.