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I tried looking into this myself but I couldn't really find much about this error. The only solutions I could find didn't work for me. The first one was to use mokutil but at the point where I was supposed to run sudo mokutil --import MOK.der it gives me the error message "Failed to get file status, MOK.der" even though I did everything it told me to do. The other one was to disable secure boot and then run sudo '/sbin/vboxconfig' but even though it looked like it worked, I'm still getting the error message. I have re-enabled secure boot, so you don't have to worry about that.
Is there something else I can try or does VirtualBox not work in Linux Mint for some reason?
I tried virt-manager but it's giving me an error message about not being able to connect to "libvirt qemu:///system" and it wont let me install a virtual machine. I'm assuming that I'm supposed to download "libvirtd", but I can't figure out how to install it. I think it wants me to build it from the source but there doesn't seem to be a guide on how to do that.
Try
sudo apt install libvirt-daemon-system libvirt-clientsin the terminal and rebooting the system.It stated that they were already installed so I went through the process of re-installing them and rebooting the computer, which seems to have fixed the problem. I wont really be able to test it much right now because of how late it is for me but I was able to at least start the installation for Windows XP.
On fedora its
sudo dnf install qemu qemu-kvm virt-managerVirt-manager alone is just the viewer, its also intended to be used for things like remote viewing. This would be an easy solution