You will need minimum version 6.1.14 of VirtualBox to run on Kernel 5.8
> you are right thanks. if I may ask you... how did you find this? what did you search on google? in general, if I encouter a bug, what can I do in order to find news by myself instead of asking here?
In my case it was experience, I already seen reports of people where virtual box didn't run after the kernel 5.8 release few weeks ago
Actually this isn't the first time, "out-of-tree"/external kernel modules like Virtual Box or VMWare break constantly with bigger kernel changes but their developer are really slow on pushing updates to fix that
Anyway I found the informations about it after searching either "virtualbox kernel 5.8" or "virtualbox-dkms kernel 5.8" (here is the bug report from above) on DuckDuckGo