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I'm trying to install guest additions on BigSur on a virtual machine. I'm following this guideline: https://stackoverflow.com/questions/41691803/how-to-install-guest-addition-in-mac-os-as-guest-and-windows-machine-as-host but the command to access recovery mode gives me operation not permitted:

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There is a way to access recovery mode from a virtual box machine maybe simulating cmd+r inserting? Or there is another way to install guest additions?

Virgula
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  • What do the support pages for VirtualBox recommend? – nohillside Nov 25 '20 at 20:40
  • @nohillside I found nothing from virtualbox documentation – Virgula Nov 25 '20 at 20:47
  • There is a rather active community forum at https://forums.virtualbox.org/viewforum.php?f=22&sid=458c967a0f4cc48233de4d56175d3ec2 – nohillside Nov 25 '20 at 21:00
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    and it could be that they don't have a guest additions package compatible with macOS 11 or that even VBox itself is not fully compatible. Your best bet on this is in the VBox forums like @nohillside mentioned. – Steve Chambers Nov 25 '20 at 21:12
  • Perhaps attach a recovery partition image to the VM and boot from there? You probably have a recovery partition dmg in your recovery partition. – Joy Jin Nov 26 '20 at 02:21
  • @JoyJin I still have the same iso from where I installed the operating system and I tried to mount it again but the only thing that spawn is a primitive shell and I can’t do anything from there – Virgula Nov 26 '20 at 08:03
  • @JoyJin but doing this does not solve the problem because once the operating system is installed booting the iso shows only a primitive shell. Anyway, I'll take a look. – Virgula Nov 26 '20 at 09:44
  • Or alternatively, try the method I suggested, which is slightly different from what you did. See if that makes any difference. – Joy Jin Nov 26 '20 at 10:09
  • @JoyJin that's what I get: https://i.imgur.com/Ox70CtO.png – Virgula Nov 26 '20 at 11:33
  • If your problem is booting to recovery mode, then simply create a virtual USB bootable installer for macOS Big Sur and boot from that. – David Anderson Nov 26 '20 at 12:23
  • Unfortunately, entering the command sudo mount -uw fails even with SIP disable under Big Sur. When you reach this point, you may want to update your question. – David Anderson Nov 26 '20 at 13:25
  • @DavidAnderson You're right I reached that point. Anyway I followed what this guy wrote here: https://apple.stackexchange.com/questions/395508/mount-root-as-writable-in-big-sur and with this trick file system is writable. There is a way to install guest addition manually once mounted the file system? – Virgula Nov 26 '20 at 15:03
  • Here's a follow-up topic: https://forums.virtualbox.org/viewtopic.php?f=22&t=100903 – arieltools Dec 11 '20 at 17:18

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