That's probably what happened, sorry.
I tried to find the source of the package, where is it written that I
downloaded it for hardy-updates ?
Indeed, I can see that 2 versions are enabled : ubuntu2(hardy) et
ubuntu(now).
--
Can't install libgtk2-dev because of wrong libgtk2 version
https://bugs.
thank you for your bug report, that's not a bug though, it seems that
you enabled hardy-updates, installed libgtk2.0-0 using this source and
then disabled the source, so either you need to downgrade libgtk2.0-0 to
the hardy version or to use hardy-updates to install the corresponding
versions
** C
