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Some time back, I used Parallels Desktop on a Mac running macOS Catalina (10.15) as a host system to create a virtual machine running OS X Sierra (10.13). Everything ran fine, if a bit slow. Then I migrated my VM to VirtualBox, following the instructions here. Everything continues to work fine, with one very minor glitch: whenever I start up the VM, it boots in verbose mode. (The original Parallels VM did not do this.) Any idea why this is happening, or what I can do to fix it?

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Note the name of your virtual machine. The example image below shows the virtual machine named "High Sierra Clone" is currently running.

enter image description here

Open a Terminal application window in the virtual machine and enter the command below.

nvram boot-args

Example output is given below.

usb=0x800 keepsyms=1 -v -serial=0x1

Open a Terminal application window on the host machine and enter the following command, where the ‑v option has been omitted from <value>.

VBoxManage setextradata "VM name" VBoxInternal2/EfiBootArgs <value>

Below is an example.

VBoxManage setextradata "High Sierra Clone" VBoxInternal2/EfiBootArgs "usb=0x800 keepsyms=1 -serial=0x1"

On restart of the virtual machine, the verbose mode was gone. However the following output did appear.


Tested using an iMac (21.5-inch, Late 2013) with macOS Catalina 10.15.7) as the host and macOS High Sierra 10.13.6 guest installed in VirtualBox 6.1.32.

References

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  • I find it more interesting how you got High Sierra running on Virtualbox haha
    – BabyBoy
    Commented Mar 4, 2022 at 19:05
  • @Lano: I do not believe I included an explanation of how I installed High Sierra as a VirtualBox guest. I used a different virtual machine to create a virtual bootable installer using the instructions from the Apple website "How to create a bootable installer for macOS". Commented Mar 4, 2022 at 23:07

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