Can you please verify the value of the variable GTK_IM_MODULES?

When I set this variable to "xim", I get the behaviour you describe.
Without setting the variable, I am able to type with dead keys (using British 
English and Greek Polytonic layouts).

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Dead keys don't work when certain Greek keyboard layouts are in the selected 
layouts list
https://bugs.launchpad.net/bugs/240615
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