Local Networking no longer possible-Unable to mount location

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http://www.unix.com – Unable to mount location Can anyone help with this please? Since recently installing 12.04 from a downloaded live CD onto my desktop computer, I have been unable to re-establish a network connection with my other local computer in Nautilus. I have once had the following message displayed: "UNABLE TO MOUNT LOCATION DBus error org.freedesktop.DBus.Error.InvalidArgs:Mountpoint Already registered" The desktop has a wired connection to hub and the other machine is wireless connected. The latter still co (HowTos)