Why did I get "Unable to open a connection to the libvirt management daemon. Libvirt URI is: qemu:///system" error when I tried to start the virt-manager graphics tool ?
Issue
Why did I get "Unable to open a connection to the libvirt management daemon. Libvirt URI is: qemu:///system" error when I tried to start the virt-manager graphics tool ?

Environment
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- libvirt
- virt-manager
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