The useful Eclipse action Search - Occurrences in File - Identifier has by default the shortcut Control+Shift+U. But under Gnome the shortcut Control+Shift+U is used for Unicode character input, indicated by an underlined u when pressed. Assigning a different shortcut is easy but there are few "traps":
- In Eclipse, go to Window - Preferences - General - Keys
- Type the filter occurr and click on "Shows the Occurrences in File Quick Menu". Do not confuse it with "Occurences in File" (binding C+S+A, when Editing in Structured T. Ed.)!
- Make sure that When is "In Windows", Category is "Search"
- Click [Unbind Command], click into the Binding field and type the keys that you want. Beware that some keys could conflict with existing bindings or global Gnome/system bindings. For me e.g. Control+Shift+S or F8 worked (though I might have to unbind conflicting bindings, I don't remember anymore).