It was a problem related to permissions.
This output shows the folders exist but as you can see they are not accessible by users other than root.
drwx------ 11 root root 4096 Mar 20 17:07 Faenza/
drwx------ 4 root root 4096 Mar 20 17:07 Faenza-Ambiance/
drwx------ 9 root root 4096 Mar 20 17:07 Faenza-Dark/
drwx------ 5 root root 4096 Mar 20 17:07 Faenza-Darker/
drwx------ 5 root root 4096 Mar 20 17:07 Faenza-Darkest/
drwx------ 4 root root 4096 Mar 20 17:07 Faenza-Radiance/
Change the rights of the folders by executing the command sudo chmod 755 -R /usr/share/icons/Faenza
and restart GNOME shell using Alt+F2 and then type r
and press Enter. faenza now shows in icon themes.
sudo apt install faenza-icon-theme
with out PPA and it is working like this..sudo apt update
? This PPA was last updated for Trusty (14.04). There is no release for Cosmic (18.10). Also, what is the output ofapt list --installed | grep faenza; ls -l /usr/share/icons/Faenza
?