Repository problem on Ubuntu 18.04

On a clean Ubuntu 18.04 system, after doing

wget https://ecsft.cern.ch/dist/cvmfs/cvmfs-release/cvmfs-release-latest_all.deb

sudo dpkg -i cvmfs-release-latest_all.deb

I get

Warning: this distribution is not supported. Using Ubuntu 12.04 packages as fallback.

According to the CVMFS 2.5.2 page, the problem with Ubuntu 18.04 repositories was supposed to be fixed.