I'm running a fresh install of Ubuntu 11.10 running Gnome Shell, everything working as it should.
I just installed Midori from regular Ubuntu repositories using Synaptic Package Manager, but when l attempt to launch it, despite the appearance of the Midori icon and the "whirl" in the top panel, the browser does not start. Switching GUI does not change the effect.
As requested, starting Midori from the terminal generates the following output:
giulio@giulio-laptop:~$ midori midori: symbol lookup error: midori: undefined symbol: webkit_web_view_get_selected_text