Reading what I wrote in comment #4, seems like I'm contradicting myself. First I say I can reproduce the problem, but later I say that after I bring the network back up it starts working again on its own. That's exactly what I'm seeing now, i.e., no bug. Tried xenial, artful and bionic. Are you guys on a desktop by any chance, with just a wifi connection perhaps?
Reading what I wrote in comment #4, seems like I'm contradicting myself. First I say I can reproduce the problem, but later I say that after I bring the network back up it starts working again on its own. That's exactly what I'm seeing now, i.e., no bug. Tried xenial, artful and bionic. Are you guys on a desktop by any chance, with just a wifi connection perhaps?