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Thanks Jon, this resolves my issue! Please fell welcome to consider the parent request closed.
Thanks Jon for your very speedy response!

When I run ST2 from the command line I get the error message you mentioned: "libgio version is less than 2.26, single instance support disabled"

I've spent the past hour trying to find a way to update this library to a version >= 2.26 using Ubuntu 10.04 -- but being a bit new to Linux I haven't had any luck so far... Is there an easy solution to updating this library? It seems that its connected to the latest release of Gnome, however Ubuntu doesn't seem to have adopted it yet for 10.04.