Finally I was able to start my VM on Big Sur. I switched my graphics controller to VBoxSVGA and that error went away. It also said 3D acceleration wasn't supported for the Graphics controller. I just downgraded it to USB 1.1 in the VB settings. I looked more closely and noticed it was saying USB 3.0 wasn't supported that I had to install a VB extension for that. I tried to start my VM again and was getting NS_ERROR_FAILURE again. It said I had to restart so I restarted my Mac again. When I installed VB this time I noticed it said it was installing its kernel extensions. I reinstalled VB choosing to uninstall both VB and FUSE. I read an article that said to reinstall VB. I tried to start my VM again and was getting NS_ERROR_FAILURE. VB said I had to restart so I restarted my Mac again.
Now, when I went to System Preferences > Security and Privacy I saw the option to grant permission to "Oracle America, Inc". It's also very easy to get your Virtualbox environment working and to get VM's running as quickly as. Got the Kernal Driver Not Installed error again. Kernel driver not installed (rc-1908) error is a very common error with Virtualbox. I started up VB, clicked Start for my VM to start. How to Fix VirtualBoxs Kernel Driver Not Installed (rc-1908) Error on a Mac. Open the Termial in recover mode and run the commands: I was able to fix this problem by following directions to configure Mac SIP to allow kernel extensions and to disable Gatekeeper requiring user consent for kernel extensions. I would go to System Preferences > Security and Privacy and would not see the option to grant permission to "Oracle America, Inc".
I tried upgrading VB to version 6.1.26 but I was still getting Kernel Driver Not Installed. klaus Oracle Corporation Posts: 979 Joined: 10.I wasn't able to run VB after upgrading to Big Sur 11.5.2.
Seems macOS stores the information elsewhere these days, and someone forgot to tell the world about it. It claims that I don't have any such approvals on record, and removing the team ID blindly doesn't make any difference either, because on next VirtualBox install I don't get asked. The tool for doing this ("spctl kext-consent") seems to be a complete noop these days (recovery mode or not). I cannot make macOS forget that I clicked on "Approve" before. I wanted to create my own screenshots today which are specifically for VirtualBox, but failed. What's also important from my own experience is that one quits the System Preferences completely after clicking on "Approve", because otherwise the decision seems to be not stored yet and the VirtualBox install will fail again and again. Should be true for any of the uncountable apps which are distributed outside the App Store. VirtualBox is not from the App Store, and thus restricting apps to this source will cause trouble. At least I don't remember ever touching this setting. Yes, the "Allow apps downloaded from:" needs to be set to "App Store and identified developers", which to my knowledge is the default on macOS.
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