Do you have any repositories other than the official ones installed?
What does the output of apt-cache policy libgtk2.0-dev give?
** Changed in: gtk+2.0 (Ubuntu)
Sourcepackagename: None => gtk+2.0
Status: New => Incomplete
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unresolvable dependencies in libgtk2.0-dev
https://bugs.launchpad.net/bugs/239301
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