WIN11 guest on Kubuntu 25.10 host. Virtualbox version is 7.2.2 installed by Discover from 'buntu repository and Guest Additions is installed from a 7.2.2.iso downloaded from the VBox site.
Guest Additions installation aborts when installing C:\WINDOWS\system32\VBoxService.exe fails. I am unsure what to do next to solve this. Error output is appended below. Suggestions appreciated.
Since upgrading to 25.10, VBox has been unstable, locking up frequently, usually after MS News is started (but also if any instruction video from YouTube is played). My previous attempt at a stable solution was version 7.2.2 using the 6.1.50 guest additions, which provided longer up times but still eventually crashed or exited if left unattended for several hours. Attempts to install other versions of Virtualbox have failed due to missing supporting programs not currently in any repository.
ERROR MESSAGE (C://Program Files/Oracle/VirtualBox Guest Additions/install_ui)
Stopped logging into separate file
Output folder: C:\Program Files\Oracle\VirtualBox Guest Additions
Setting application mode to 64-bit
Version: 7.2.2 (Rev 170484)
No previous version of Oracle VirtualBox Guest Additions detected
Preparing for >= W2K ...
Deleting certificates ...
Preparing for >= Vista ...
Setting application mode to 64-bit
Restoring original D3D files ...
Verifying file "C:\WINDOWS\system32\msd3d8.dll" (vendor: Microsoft Corporation, arch: amd64) ...
File "C:\WINDOWS\system32\msd3d8.dll" was not found
Verifying file "C:\WINDOWS\system32\d3d8.dll" (vendor: Oracle Corporation, arch: amd64) ...
File "C:\WINDOWS\system32\d3d8.dll" was not found
Skipping to copy file "C:\WINDOWS\system32\msd3d8.dll" to "C:\WINDOWS\system32\d3d8.dll" (not Vendor: Microsoft Corporation, Architecture: amd64)
Verifying file "C:\WINDOWS\system32\msd3d9.dll" (vendor: Microsoft Corporation, arch: amd64) ...
File "C:\WINDOWS\system32\msd3d9.dll" was not found
Verifying file "C:\WINDOWS\system32\d3d9.dll" (vendor: Oracle Corporation, arch: amd64) ...
File "C:\WINDOWS\system32\d3d9.dll" found
Getting architecture of file "C:\WINDOWS\system32\d3d9.dll" ...
Architecture is: amd64
Architecture is: amd64
Vendor is: Microsoft Corporation
File "C:\WINDOWS\system32\d3d9.dll" is invalid
Skipping to copy file "C:\WINDOWS\system32\msd3d9.dll" to "C:\WINDOWS\system32\d3d9.dll" (not Vendor: Microsoft Corporation, Architecture: amd64)
Verifying file "C:\WINDOWS\SysWOW64\msd3d8.dll" (vendor: Microsoft Corporation, arch: x86) ...
File "C:\WINDOWS\SysWOW64\msd3d8.dll" was not found
Verifying file "C:\WINDOWS\SysWOW64\d3d8.dll" (vendor: Oracle Corporation, arch: x86) ...
File "C:\WINDOWS\SysWOW64\d3d8.dll" found
Getting architecture of file "C:\WINDOWS\SysWOW64\d3d8.dll" ...
Architecture is: x86
Architecture is: x86
Vendor is: Microsoft Corporation
File "C:\WINDOWS\SysWOW64\d3d8.dll" is invalid
Skipping to copy file "C:\WINDOWS\SysWOW64\msd3d8.dll" to "C:\WINDOWS\SysWOW64\d3d8.dll" (not Vendor: Microsoft Corporation, Architecture: x86)
Verifying file "C:\WINDOWS\SysWOW64\msd3d9.dll" (vendor: Microsoft Corporation, arch: x86) ...
File "C:\WINDOWS\SysWOW64\msd3d9.dll" was not found
Verifying file "C:\WINDOWS\SysWOW64\d3d9.dll" (vendor: Oracle Corporation, arch: x86) ...
File "C:\WINDOWS\SysWOW64\d3d9.dll" found
Getting architecture of file "C:\WINDOWS\SysWOW64\d3d9.dll" ...
Architecture is: x86
Architecture is: x86
Vendor is: Microsoft Corporation
File "C:\WINDOWS\SysWOW64\d3d9.dll" is invalid
Skipping to copy file "C:\WINDOWS\SysWOW64\msd3d9.dll" to "C:\WINDOWS\SysWOW64\d3d9.dll" (not Vendor: Microsoft Corporation, Architecture: x86)
Uninstalling VBoxMMR ...
Stopping VBoxMMR ...
Stopping VBoxMMR done.
Output folder: C:\Program Files\Oracle\VirtualBox Guest Additions
Extracting files to: C:\Program Files\Oracle\VirtualBox Guest Additions
Output folder: C:\Program Files\Oracle\VirtualBox Guest Additions\VBoxGuest
Extract: VBoxGuest.sys
Extract: VBoxGuest.inf
Extract: VBoxTray.exe
Extract: VBoxControl.exe
Extract: VBoxHook.dll
Extract: vboxguest.cat
Output folder: C:\Program Files\Oracle\VirtualBox Guest Additions\VBoxMouse
Extract: VBoxMouse.sys
Extract: VBoxMouse.inf
Extract: vboxmouse.cat
Output folder: C:\Program Files\Oracle\VirtualBox Guest Additions\VBoxVideo
Extract: VBoxVideo.sys
Extract: VBoxDisp.dll
Extract: VBoxVideo.inf
Extract: VBoxVideo.cat
Output folder: C:\Program Files\Oracle\VirtualBox Guest Additions\VBoxWddm
Extract: vboxwddm.cat
Extract: VBoxWddm.sys
Extract: VBoxWddm.inf
Extract: VBoxDispD3D.dll
Extract: VBoxDX.dll
Extract: VBoxNine.dll
Extract: VBoxSVGA.dll
Extract: VBoxGL.dll
Extract: VBoxDispD3D-x86.dll
Extract: VBoxDX-x86.dll
Extract: VBoxNine-x86.dll
Extract: VBoxSVGA-x86.dll
Extract: VBoxGL-x86.dll
Output folder: C:\Program Files\Oracle\VirtualBox Guest Additions\VBoxSF
Extract: VBoxSF.sys
Extract: VBoxMRXNP.dll
Extract: VBoxMRXNP-x86.dll
Output folder: C:\Program Files\Oracle\VirtualBox Guest Additions\AutoLogon
Extract: VBoxGINA.dll
Extract: VBoxCredProv.dll
Output folder: C:\Program Files\Oracle\VirtualBox Guest Additions\Cert
Extract: VBoxCertUtil.exe
Output folder: C:\Program Files\Oracle\VirtualBox Guest Additions\Bin
Extract: VBoxService.exe
Output folder: C:\Program Files\Oracle\VirtualBox Guest Additions\Tools
Extract: VBoxDrvInst.exe
Extract: VBoxGuestInstallHelper.exe
Extract: VBoxAudioTest.exe
Extracting files for >= W2K ...
Extracting certificates ...
Output folder: C:\Program Files\Oracle\VirtualBox Guest Additions\Cert
Extract: vbox-sha1-root.cer
Extract: vbox-sha1-timestamp-root.cer
Extract: vbox-sha256-root.cer
Extract: vbox-sha256-timestamp-root.cer
Output folder: C:\WINDOWS\system32
Can't write: C:\WINDOWS\system32\VBoxService.exe
An error occurred during installation.
Please refer to the log file under 'C:\Program Files\Oracle\VirtualBox Guest Additions\install_ui.log' for more information.