I am having the same problem on Kubuntu 16.04 machine, not in a VM.
In syslog:
Mar 13 11:18:04 gfx-desktop avahi-daemon[1040]: Withdrawing address record for 10.122.2.113 on enp3s0.
Mar 13 11:18:04 gfx-desktop avahi-daemon[1040]: Leaving mDNS multicast group on interface enp3s0.IPv4 with address 10.122.2.113.
Mar 13 11:18:04 gfx-desktop avahi-daemon[1040]: Interface enp3s0.IPv4 no longer relevant for mDNS.
...
Mar 13 11:18:04 gfx-desktop whoopsie[1056]: [11:18:04] Cannot reach: https://daisy.ubuntu.com
Mar 13 11:18:04 gfx-desktop whoopsie[1056]: [11:18:04] offline
ifconfig would show an inet6 address, but no inet address (IPv4).
I am able to recover by plugging the network cable out and then back in.
Also, I can recover by:
sudo ifconfig enp3s0 down
sudo ifconfig ens3s0 up
I have tried two different NICs.
After calling two ifconfig lines above, syslog has [see attached file].
I am having the same problem on Kubuntu 16.04 machine, not in a VM.
In syslog: /daisy. ubuntu. com
Mar 13 11:18:04 gfx-desktop avahi-daemon[1040]: Withdrawing address record for 10.122.2.113 on enp3s0.
Mar 13 11:18:04 gfx-desktop avahi-daemon[1040]: Leaving mDNS multicast group on interface enp3s0.IPv4 with address 10.122.2.113.
Mar 13 11:18:04 gfx-desktop avahi-daemon[1040]: Interface enp3s0.IPv4 no longer relevant for mDNS.
...
Mar 13 11:18:04 gfx-desktop whoopsie[1056]: [11:18:04] Cannot reach: https:/
Mar 13 11:18:04 gfx-desktop whoopsie[1056]: [11:18:04] offline
ifconfig would show an inet6 address, but no inet address (IPv4).
I am able to recover by plugging the network cable out and then back in.
Also, I can recover by:
sudo ifconfig enp3s0 down
sudo ifconfig ens3s0 up
I have tried two different NICs.
After calling two ifconfig lines above, syslog has [see attached file].