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How To Fix “No Active Connection to Installed On” Error in KVM Virt-Manager

Ubuntu 15

If you’re using the KVM (Kernel-based Virtual Machine) Virt-Manager and you’ve encountered the “No active connection to installed on” error, it’s likely that there’s an issue with the connection to the virtualization software. This article will guide you through several potential solutions to resolve this problem.

Check User Group Membership

The first thing to check is whether your username is part of the libvirt group. Being a member of this group is essential for managing virtual machines. If you’re not part of this group, you can add your username by running the following command in the terminal:

sudo adduser <username> libvirt

Or, if the user already exists, use:

sudo usermod -a -G libvirt <username>

In both commands, replace <username> with your actual username. These commands add your user to the libvirt group, which can potentially resolve the connection issue.

Verify Ownership of Libvirt Socket

Next, check the ownership of the libvirt socket. The libvirt socket is a special file used for communication between the libvirt daemon and the applications using it. If the ownership is incorrect, it can prevent the connection from being established. You can ensure your user owns the libvirt socket by running:

sudo chown username:username /var/run/libvirt/libvirt-sock

Again, replace “username” with your actual username. This command changes the ownership of the libvirt socket to your user, which can help establish a connection.

Install Necessary Packages

Another potential issue could be missing packages. Make sure you have all the necessary packages installed for KVM and virt-manager to function correctly. You can install any missing packages by running:

sudo apt install -y qemu-kvm libvirt0 libvirt-bin virt-manager bridge-utils

This command installs the qemu-kvm (the main KVM package), libvirt0 (the virtualization API), libvirt-bin (the binaries for the libvirt library), virt-manager (the virtual machine manager), and bridge-utils (utilities for configuring Ethernet bridges).

After installing these packages, enable the libvirt-bin service with:

sudo systemctl enable libvirt-bin

This command ensures the libvirt-bin service starts automatically at boot.

Check Service Status

You should also check if the libvirtd and libvirt-bin services are running. These services are crucial for managing virtual machines. You can verify their status with the following commands:

sudo service libvirtd status
sudo service libvirt-bin status

If they are not running, you can start them with:

sudo service libvirtd start
sudo service libvirt-bin start

Reboot Your Machine

If none of the above solutions work, try rebooting your machine. Sometimes, a simple reboot can resolve the issue.

sudo reboot

This command will reboot your machine.

Conclusion

The “No active connection to installed on” error in KVM Virt-Manager can be frustrating, but it’s usually solvable with a bit of troubleshooting. By ensuring your user is part of the correct group, verifying the ownership of the libvirt socket, installing necessary packages, checking the status of essential services, and potentially rebooting your machine, you should be able to resolve the issue and get back to managing your virtual machines.

Remember, if you encounter any issues or need further assistance, you can always refer to the official libvirt documentation or seek help on the libvirt mailing list.

How do I check my user group membership?

To check your user group membership, you can run the following command in the terminal: groups. This command will display all the groups that your user is a member of, including the libvirt group.

How do I change ownership of the libvirt socket?

To change ownership of the libvirt socket, you can use the chown command. For example, to change ownership to the user "username", you would run: sudo chown username:username /var/run/libvirt/libvirt-sock.

How do I install missing packages for KVM and virt-manager?

You can install missing packages by running the command: sudo apt install -y qemu-kvm libvirt0 libvirt-bin virt-manager bridge-utils. This command will install the necessary packages for KVM and virt-manager to function correctly.

How do I enable the libvirt-bin service?

To enable the libvirt-bin service, you can run the command: sudo systemctl enable libvirt-bin. This command ensures that the libvirt-bin service starts automatically at boot.

How do I check the status of the libvirtd and libvirt-bin services?

You can check the status of the libvirtd and libvirt-bin services by running the commands: sudo service libvirtd status and sudo service libvirt-bin status. These commands will display the current status of the services.

How do I start the libvirtd and libvirt-bin services?

If the libvirtd and libvirt-bin services are not running, you can start them by running the commands: sudo service libvirtd start and sudo service libvirt-bin start. These commands will start the services.

What should I do if none of the above solutions work?

If none of the above solutions work, you can try rebooting your machine by running the command: sudo reboot. Sometimes, a simple reboot can resolve the issue.

Where can I find more information or seek further assistance?

If you encounter any issues or need further assistance, you can refer to the official libvirt documentation or seek help on the libvirt mailing list.

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