Same problem with gtk3:
$ sudo apt install libgtk-3-dev:amd64 libgtk-3-dev:i386
Reading package lists... Done
Building dependency tree
Reading state information... Done
libgtk-3-dev is already the newest version (3.22.28-1ubuntu3).
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
libgtk-3-dev:i386 : Depends: libgdk-pixbuf2.0-dev:i386 (>= 2.30.0) but it is
not going to be installed
Depends: libpango1.0-dev:i386 (>= 1.40.5) but it is not
going to be installed
Depends: libegl1-mesa-dev:i386 but it is not going to be
installed
Depends: libxkbcommon-dev:i386 but it is not going to be
installed
E: Unable to correct problems, you have held broken packages.
** Also affects: gtk+3.0 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1317116
Title:
libgtk2.0-dev is not multiarch-ready
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