Unable to mount Samba share from an Ubuntu 10.04 machine on any Ubuntu 11.10 machines

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http://askubuntu.com – I have Samba share from a Ubuntu 10.04 machine which I seem to have no problems mounting in Windows XP running in VirtualBox. However, when I try to mount it directly in Unity, whether using the nautilus smb://name command or by double-clicking on the icon in the network browser -- it always times out with "unable to mount location" "failed to retrieve share list from server" I have verified this on two different 11.10 machines. I have no idea where to look for the solution. Vice versa (that is, mounting the Samba shares from the 11.10 machines on the 10.04 machine) works fine. When I type (HowTos)