fluxgui / python-gconf not installable on Kubuntu 19.04

Question

On Kubuntu 19.04 I'm trying to install f.lux, but I'm missing python-gconf dependency. When I try to install it, the terminal says:

Package python-gconf is not available, but is referred to by another package. 
This may mean that the package is missing, has been obsoleted, or is only available from another source 
E: Package 'python-gconf' has no installation candidate

Answer 1

You can install python-gconf manually from cosmic repository:

cd ~/Downloads
wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gnome-python/python-gconf_2.28.1+dfsg-1.2_amd64.deb
sudo apt-get install ./python-gconf_2.28.1+dfsg-1.2_amd64.deb

(usually this method is not recommended, but we do not have other methods)