Unable to install python3-dev ubuntu

The solution is to wait for the Ubuntu developers to re-upload Python 3.4.3 to the updates repository. This should happen any day now. Keep your eyes on bug #1348954.

Edit: Fixed. Installing python3-dev works again.

Okay So I went through this and temporarily solved the problem by forcefully downgrading my python

apt-get install -y \
  python3.4=3.4.0-2ubuntu1.1 \
  python3.4-minimal=3.4.0-2ubuntu1.1 \
  libpython3.4-stdlib=3.4.0-2ubuntu1.1 \
  libpython3.4-minimal=3.4.0-2ubuntu1.1

Edit: After this reinstall stdlib as it misses some libraries. Removing python3 might remove some packages of your desktop environment reinstall the desktop environment in that case.

I had some issues with lightdm after this. Before removing print the removed packages and reinstall them with new python 3