If a user cannot operate normally after logging into a virtual machine using VNC in Huawei FusionCompute, what is the most likely cause?

When considering the scenario where a user is unable to operate normally after logging into a virtual machine via VNC in Huawei FusionCompute, the most plausible cause is that the management link is unstable.

VNC (Virtual Network Computing) relies on a stable connection to facilitate remote control of the virtual machine's graphical interface. The management link is crucial because it connects the user to the virtual machine's management resources, which coordinate functions like display updates, input data, and overall user commands. If this management link experiences instability, the user's interaction can be erratic, leading to a poor operational experience.

In contrast, while issues like a corrupted virtual machine, unstable service links, or unstable storage links can cause problems, they typically present themselves differently. For example, a corrupted virtual machine may not allow access at all, while unstable service links would likely impact the overall availability of services rather than the specific connection quality used for remote desktop operations like VNC. Therefore, an unstable management link directly affects the ability to operate smoothly within the virtual environment, making this the most likely cause in the given context.