virtualbox.org

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hostnamectl; # guest
   Static hostname: debian10template
         Icon name: computer-vm
           Chassis: vm
    Virtualization: oracle
  Operating System: Debian GNU/Linux 10 (buster)
            Kernel: Linux 4.19.0-11-amd64
      Architecture: x86-64

# there is no qemu kvm installed on host
dpkg -l|grep qemu-kvm

apt update;
apt upgrade;
apt install build-essential module-assistant linux-headers-$(uname -r) vim

# recompile guest additions works
/virtualbox/VBoxLinuxAdditions.run

# loading the module ain't workin (never change a running system ay?)
modprobe vboxsf
modprobe: ERROR: could not insert 'vboxsf': Unknown symbol in module, or unknown parameter (see dmesg

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dmesg; # says
[  146.839836] 15:14:57.740338 main     VBoxService 6.1.2 r135662 (verbosity: 0) linux.amd64 (Jan 13 2020 12:06:55) release log
               15:14:57.74034
[  146.840109] 15:14:57.741154 main     OS Product: Linux
[  146.840365] 15:14:57.741371 main     OS Release: 4.19.0-11-amd64
[  146.840711] 15:14:57.741622 main     OS Version: #1 SMP Debian 4.19.146-1 (2020-09-17)
[  146.841328] 15:14:57.741968 main     Executable: /opt/VBoxGuestAdditions-6.1.2/sbin/VBoxService
               15:14:57.741969 main     Process ID: 10584
[  146.842885] 15:14:57.743782 main     6.1.2 r135662 started. Verbose level = 0
[  146.846211] 15:14:57.746944 main     vbglR3GuestCtrlDetectPeekGetCancelSupport: Supported (#1)
[  146.850221] 15:14:57.750977 main     Error: Failed to become guest control master: VERR_VERSION_MISMATCH
[  146.851184] 15:14:57.751802 main     Error: Service 'control' failed to initialize: VERR_VERSION_MISMATCH
[  146.851688] 15:14:57.752552 main     Session 0 is about to close ...
[  146.852792] 15:14:57.753628 main     Stopping all guest processes ...
[  146.853141] 15:14:57.754059 main     Closing all guest files ...
[  146.853658] 15:14:57.754698 main     Ended.
[  334.497075] vboxsf: loading out-of-tree module taints kernel.
[  334.497141] vboxsf: module verification failed: signature and/or required key missing - tainting kernel
[  334.497179] vboxsf: Unknown symbol VBoxGuest_RTLogBackdoorPrintf (err -2)
[  334.497199] vboxsf: Unknown symbol VBoxGuestIDC (err -2)
[  334.497218] vboxsf: Unknown symbol VBoxGuest_RTSemFastMutexRequest (err -2)
[  334.497231] vboxsf: Unknown symbol VBoxGuest_RTSemFastMutexRelease (err -2)
[  334.497239] vboxsf: Unknown symbol VBoxGuest_RTStrNLen (err -2)
[  334.497251] vboxsf: Unknown symbol VBoxGuest_RTLogRelGetDefaultInstanceEx (err -2)
[  334.497262] vboxsf: Unknown symbol VBoxGuest_RTStrCopy (err -2)
[  334.497273] vboxsf: Unknown symbol VBoxGuest_RTErrConvertToErrno (err -2)
[  334.497293] vboxsf: Unknown symbol VBoxGuest_RTSemFastMutexCreate (err -2)
[  334.497300] vboxsf: Unknown symbol VBoxGuest_RTSemFastMutexDestroy (err -2)
[  334.497311] vboxsf: Unknown symbol VBoxGuest_RTMemContFree (err -2)
[  334.497319] vboxsf: Unknown symbol VBoxGuest_RTSemMutexRelease (err -2)
[  334.497330] vboxsf: Unknown symbol VBoxGuest_rtR0MemObjLinuxVirtToPage (err -2)
[  334.497343] vboxsf: Unknown symbol VBoxGuest_RTAssertShouldPanic (err -2)
[  334.497355] vboxsf: Unknown symbol VBoxGuest_RTLogLoggerEx (err -2)
[  334.497366] vboxsf: Unknown symbol VBoxGuest_RTMemContAlloc (err -2)
[  334.497376] vboxsf: Unknown symbol VBoxGuest_RTSemMutexRequest (err -2)
[  334.497384] vboxsf: Unknown symbol VBoxGuest_RTSemMutexCreate (err -2)
[  334.497392] vboxsf: Unknown symbol VBoxGuest_RTSemMutexDestroy (err -2)
[  334.497405] vboxsf: Unknown symbol VBoxGuest_RTAssertMsg1Weak (err -2)
[  334.497427] vboxsf: Unknown symbol VBoxGuest_RTAssertMsg2Weak (err -2)

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[   14.241573] vboxsf: loading out-of-tree module taints kernel.
[   14.241639] vboxsf: module verification failed: signature and/or required key missing - tainting kernel
[   14.241692] vboxsf: Unknown symbol VBoxGuest_RTLogBackdoorPrintf (err -2)
[   14.241724] vboxsf: Unknown symbol VBoxGuestIDC (err -2)
[   14.241759] vboxsf: Unknown symbol VBoxGuest_RTSemFastMutexRequest (err -2)
[   14.241783] vboxsf: Unknown symbol VBoxGuest_RTSemFastMutexRelease (err -2)
[   14.241799] vboxsf: Unknown symbol VBoxGuest_RTStrNLen (err -2)
[   14.241820] vboxsf: Unknown symbol VBoxGuest_RTLogRelGetDefaultInstanceEx (err -2)
[   14.241842] vboxsf: Unknown symbol VBoxGuest_RTStrCopy (err -2)
[   14.241862] vboxsf: Unknown symbol VBoxGuest_RTErrConvertToErrno (err -2)
[   14.241895] vboxsf: Unknown symbol VBoxGuest_RTSemFastMutexCreate (err -2)
[   14.241911] vboxsf: Unknown symbol VBoxGuest_RTSemFastMutexDestroy (err -2)
[   14.241932] vboxsf: Unknown symbol VBoxGuest_RTMemContFree (err -2)
[   14.241947] vboxsf: Unknown symbol VBoxGuest_RTSemMutexRelease (err -2)
[   14.241969] vboxsf: Unknown symbol VBoxGuest_rtR0MemObjLinuxVirtToPage (err -2)
[   14.241992] vboxsf: Unknown symbol VBoxGuest_RTAssertShouldPanic (err -2)
[   14.242017] vboxsf: Unknown symbol VBoxGuest_RTLogLoggerEx (err -2)
[   14.242037] vboxsf: Unknown symbol VBoxGuest_RTMemContAlloc (err -2)
[   14.242057] vboxsf: Unknown symbol VBoxGuest_RTSemMutexRequest (err -2)
[   14.242075] vboxsf: Unknown symbol VBoxGuest_RTSemMutexCreate (err -2)
[   14.242092] vboxsf: Unknown symbol VBoxGuest_RTSemMutexDestroy (err -2)
[   14.242116] vboxsf: Unknown symbol VBoxGuest_RTAssertMsg1Weak (err -2)
[   14.242156] vboxsf: Unknown symbol VBoxGuest_RTAssertMsg2Weak (err -2)