I have found the answer.
Troubleshooting Windows Insider 11 Installation on Virtualbox with - Microsoft Community
change of chipset settings in VirtualBox fixed the update problem.
This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
I've been trying to update to a new build on the Canary channel but it fails on reboot. (see screenshot)
I've tried 25931 via windows update and ISO and today 25947 via windows update after a clean install of 25393.
I have always used VirtualBox for the insider preview and this is the first time having a problem. I also tried using 25931.iso for a clean install but VirtualBox will not boot from the ISO.
Any ideas anyone?
I have found the answer.
Troubleshooting Windows Insider 11 Installation on Virtualbox with - Microsoft Community
change of chipset settings in VirtualBox fixed the update problem.
Hello,
I highly recommend to disconnect external devices while you perform the upgrade.
Hope this helps!