Microsoft has confirmed compatibility issues with virtualization software Oracle VirtualBox for Windows 11, just as the new operating system is finally released.
In a statement, the company said that it found a compatibility issue between VirtualBox and Windows 11 when Hyper-V or Windows Hypervisor is installed.
“You might be unable to start virtual machines (VMs) and you might receive an error. To safeguard your upgrade experience, we have applied a compatibility hold on these devices from installing or being offered Windows 11,” Microsoft said in a statement.
Microsoft said to work around the issue, users would have to remove Hyper-V or Windows Hypervisor until this issue is resolved with an update. It added that Oracle plans to release an update in October 2021, and users can check on its progress here.
Users were recommended not to manually upgrade using the “update now” button or the Media Creation Tool until this issue has been resolved.
“If you are trying to upgrade to Windows 11, you might encounter an upgrade compatibility hold and receive the message, "VirtualBox. Your PC requires the latest version of this app. Click Learn More for more information on how to update this app,” the company said.
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The same webpage also notified prospective Windows 11 users of a few additional issues.
The first concerns compatibility issues with Intel "Killer" networking software and Windows 11. It said devices with the affected software might drop user datagram protocol (UDP) packets under certain conditions.
“This creates performance and other problems for protocols based on UDP. For example, some websites might load slower than others in affected devices, with videos streaming slower in certain resolutions. VPN solutions based on UDP might also be slower,” the advisory noted.
Microsoft said it was working on a resolution and targeting its release in the October 12 security update.
The last issues the advisory noted were problems with the Cốc Cốc browser and Windows 11. The browser in question might be unable to open and, on some devices, might cause other issues or errors. Microsoft has also placed a compatibility hold on these devices from installing or being offered Windows 11.
Microsoft is offering Windows 11 upgrades using a phased rollout that targets eligible new devices first. Availability will increase over time, according to the company.
