Install libgtk-3-dev on Ubuntu 20.04

  apt-get, c++, gtk, ubuntu-20.04, user-interface

I would like to write a GUI in cpp. As far as I know gtk is a nice solution for this. Sadly it appears to me that gtk is no longer available under Ubuntu 20.04. (I am using Xubuntu if this matters)

Executing: sudo apt install libgtk-3-dev

Leads to:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
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 : Depends: gir1.2-gtk-3.0 (= 3.24.20-0ubuntu1) but 3.24.20-1 is to be installed
                Depends: libatk-bridge2.0-dev but it is not going to be installed
                Depends: libatk1.0-dev (>= 2.15.1) but it is not going to be installed
                Depends: libcairo2-dev (>= 1.14.0) but it is not going to be installed
                Depends: libfontconfig1-dev but it is not going to be installed
                Depends: libgdk-pixbuf2.0-dev (>= 2.40.0) but it is not going to be installed
                Depends: libglib2.0-dev (>= 2.57.2) but it is not going to be installed
                Depends: libpango1.0-dev (>= 1.41) but it is not going to be installed
                Depends: libxi-dev but it is not going to be installed
                Depends: libgtk-3-0 (= 3.24.20-0ubuntu1) but 3.24.20-1 is to be installed
E: Unable to correct problems, you have held broken packages.

I am looking for a solution to install libgtk-3-dev or another cross-platform GUI library.

Source: Windows Questions C++

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