How to deal with VMware Ubuntu VMs hanging without internet access？

Environment Information

• Host Operating System: Windows 11 Home Chinese Edition (64-bit)
• VM Software: VMware® Workstation 16 Pro 16.1.0
• Guest OS: Ubuntu 20.04.3 LTS 64-bit
• Network Adapter Mode: NAT

Problem Description

When attempting to suspend and resume the Ubuntu virtual machine, a non-recoverable error occurs in VMware, and upon resuming, the VM loses its ability to connect to the internet.

Solution Steps

Step One: Investigate and Resolve Virtualization Conflicts

Firstly, verify if the issue is due to conflicts between Hyper-V and VMware’s virtualization technologies. Although disabling Hyper-V can sometimes help resolve issues, as you’ve found, this method did not solve the problem entirely. In some cases, even with Hyper-V disabled, similar problems may persist.

Step Two: Restart Network Management Services

Executing these commands can refresh the network configuration, which sometimes resolves connectivity issues:

sudo systemctl stop NetworkManager
sudo rm /var/lib/NetworkManager/NetworkManager.state
sudo systemctl start NetworkManager

Step Three: Adjust Network Adapter Settings

1. Temporarily Switch to Bridged Mode: Change the VM’s network adapter from NAT mode to bridged mode. This allows the VM to use the host’s physical network interface directly.
2. Restart Network Services: After switching the network mode, restart the network management service using the commands from Step Two.
3. Revert to Original Network Mode: Once you confirm that the network connection works, you can switch the network adapter back to its original setting (e.g., NAT).

Step Four: Update or Reset Network Configuration

If the above methods do not work, consider updating your VM’s network card drivers or try resetting the network configuration. For Ubuntu, adjust network settings by editing the configuration files under /etc/netplan/ to ensure they match the current network environment.

Step Five: Check VMware Tools Status

Ensure that VMware Tools is properly installed and running, as it is crucial for good interaction between the host and guest systems, including stable network connections.

Additional Recommendations

• If you continue to encounter non-recoverable errors in VMware along with VMDB errors, consider upgrading VMware Workstation to the latest version or check for available patches.
• For recurring VMDB errors, deeper investigation into VMware’s log files might be necessary to gather more diagnostic information. Additionally, inquire on official forums or support channels for targeted solutions.

By following these steps, you should be able to address the network connectivity issue after suspending and resuming the Ubuntu VM. If the problem persists, collecting detailed log information and contacting VMware’s technical support team for further assistance would be advisable.