I also need to add to this thread...
I updated VirtualBox from 6.1.8 to 6.1.16 on my Mac running Mojave and the installer failed with "The installation failed. The installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance."
I remebered this to be common and usually you just need to allow the kernel extensions in "Preferences > Security & Privacy > General". But nothing was there, also I would expect that on a fresh install not an update. VirtualBox ran just fine before the update!
I checked the loaded kexts, but nothing:
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# kextstat | grep -i virt
159 0 0xffffff7f8491e000 0x13000 0x13000 com.apple.driver.AppleVirtIO (2.1.3) CAFDF80E-E7BD-3916-9BB0-41F51B5A6471 <79 21 13 6 5 3 1>
I ran
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# sudo spctl --master-disable
Found this script and tried to load/unload the kexts that way and get them to appear in Preferences:
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# bash -x vbox_kext.sh
+ case "$1" in
+ unload
++ ps -ef
++ grep -c 'VirtualBox$'
+ '[' 0 -ne 0 ']'
++ ps -ef
++ grep -c '[V]ir'
+ '[' 0 -gt 0 ']'
+ echo 'Unloading Kernel Extensions'
Unloading Kernel Extensions
+ kextstat
+ grep org.virtualbox.kext.VBoxUSB
+ kextstat
+ grep org.virtualbox.kext.VBoxNetFlt
+ kextstat
+ grep org.virtualbox.kext.VBoxNetAdp
+ kextstat
+ grep org.virtualbox.kext.VBoxDrv
+ load
+ echo 'Loading Kernel Extentions'
Loading Kernel Extentions
+ sudo kextload '/Library/Application Support/VirtualBox/VBoxDrv.kext' -r '/Library/Application Support/VirtualBox/'
Password:
/Library/Application Support/VirtualBox/VBoxDrv.kext failed to load - (libkern/kext) not loadable (reason unspecified); check the system/kernel logs for errors or try kextutil(8).
+ sudo kextload '/Library/Application Support/VirtualBox/VBoxNetAdp.kext' -r '/Library/Application Support/VirtualBox/'
/Library/Application Support/VirtualBox/VBoxNetAdp.kext failed to load - (libkern/kext) not loadable (reason unspecified); check the system/kernel logs for errors or try kextutil(8).
+ sudo kextload '/Library/Application Support/VirtualBox/VBoxNetFlt.kext' -r '/Library/Application Support/VirtualBox/'
/Library/Application Support/VirtualBox/VBoxNetFlt.kext failed to load - (libkern/kext) not loadable (reason unspecified); check the system/kernel logs for errors or try kextutil(8).
+ sudo kextload '/Library/Application Support/VirtualBox/VBoxUSB.kext' -r '/Library/Application Support/VirtualBox/'
/Library/Application Support/VirtualBox/VBoxUSB.kext failed to load - (libkern/kext) not loadable (reason unspecified); check the system/kernel logs for errors or try kextutil(8).
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# /usr/sbin/spctl kext-consent add VB5E2TV963
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# cd '/Library/Application Support/VirtualBox/'
# spctl -a -vv -t install VBoxNetAdp.kext
VBoxNetAdp.kext: accepted
source=Notarized Developer ID
override=security disabled
origin=Developer ID Application: Oracle America, Inc. (VB5E2TV963)
Compare (the consent-list was empty before I did that):
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# spctl kext-consent list
Allowed Team Identifiers:
VB5E2TV963
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# csrutil disable
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# kextstat | grep -i virt
111 3 0xffffff7f83ee0000 0xf2000 0xf2000 org.virtualbox.kext.VBoxDrv (6.1.16) DAF044F0-5043-3B8E-8758-5A462567BDAA <8 6 5 3 1>
164 0 0xffffff7f848ce000 0x13000 0x13000 com.apple.driver.AppleVirtIO (2.1.3) CAFDF80E-E7BD-3916-9BB0-41F51B5A6471 <79 21 13 6 5 3 1>
166 0 0xffffff7f848e1000 0x8000 0x8000 org.virtualbox.kext.VBoxUSB (6.1.16) CA33FA52-5933-3F0E-9B40-8B1ECF4D6A36 <165 111 64 8 6 5 3 1>
184 0 0xffffff7f85c6b000 0x5000 0x5000 org.virtualbox.kext.VBoxNetFlt (6.1.16) C93EAF6A-676F-3370-BAE2-BDFD2BF16582 <111 8 6 5 3 1>
185 0 0xffffff7f85c70000 0x6000 0x6000 org.virtualbox.kext.VBoxNetAdp (6.1.16) 76200407-D2F0-3D84-BCCF-7EEA18F16654 <111 6 5 1>
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# sw_vers -productVersion
10.14.6
Thanks!
EDIT: So I have actually been able to fix this right now. I cannot fully recall which error
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# sudo kextutil -t VBoxDrv.kext
In the end I could fix it by running the following from the rescue environment after unlocking "Macintosh HD"
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# chflags restricted /Volumes/Macintosh\ HD/private/var/db/KernelExtensionManagement
# chflags restricted /Volumes/Macintosh\ HD/private/var/db/KernelExtensionManagement/Staging
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# ls -ldO /Volumes/Macintosh\ HD/private/var/db/KernelExtensionManagement
drwxr-xr-x@ 3 root wheel restricted 96 30 Sep 12:16 /Volumes/Macintosh HD/private/var/db/KernelExtensionManagement
# ls -ldO /Volumes/Macintosh\ HD/private/var/db/KernelExtensionManagement/Staging
drwxr-xr-x 2 root wheel restricted 64 4 Nov 21:57 /Volumes/Macintosh HD/private/var/db/KernelExtensionManagement/Staging