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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?
Have you tried to download it on the host to a USB (formatted with fat32) and then in Boxes select that usb in Windows to copy and run the software?
While I have already found a solution (and with it found out that the software doesn't even work in windows xp) the only way to download Boxes that I could find was through flathub, which doesn't allow usb devices for some reason. What does work is that I can just put all of the files I want transferred into an iso file and mount it to the VM.
Also, if there is a way to install Boxes outside of flathub, I'll have to check it out tomorrow because of late it is for me right now.
Yes there is such a way.