Good news ! This bug seems to have disappeared since I upgraded my two PC toward Kubuntu 17.04. No problem for several weeks, after two years of problems...
In fact, it seems that Kubuntu does not launch anymore dnsmasq. It does not appear in the results of the command:
sudo /etc/init.d/network-manager status
In my package manager, I see that the dnsmasq package is not installed, but the dnsmasq-base is.
Good news ! This bug seems to have disappeared since I upgraded my two PC toward Kubuntu 17.04. No problem for several weeks, after two years of problems...
In fact, it seems that Kubuntu does not launch anymore dnsmasq. It does not appear in the results of the command: d/network- manager status
sudo /etc/init.
In my package manager, I see that the dnsmasq package is not installed, but the dnsmasq-base is.
Thanks to anyone who solved that !