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]. ** Attachment added: "syslog" https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1586528/+attachment/4837089/+files/syslog.txt -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1586528 Title: Avahi-daemon withdraws address record Status in avahi package in Ubuntu: Invalid Status in network-manager package in Ubuntu: New Bug description: For some reason, if I leave my Ubuntu VM up for a prolonged period of time the machine will lose connection to the network. ip addr shows that the nic port no longer has an address and an examination of the syslog shows this: May 27 14:19:38 matt-VirtualBox avahi-daemon[590]: Withdrawing address record for 10.0.2.15 on enp0s3. May 27 14:19:38 matt-VirtualBox avahi-daemon[590]: Leaving mDNS multicast group on interface enp0s3.IPv4 with address 10.0.2.15. May 27 14:19:38 matt-VirtualBox avahi-daemon[590]: Interface enp0s3.IPv4 no longer relevant for mDNS. for no known reason. The only reliable way to get the network to come back (that I have found) is a full reboot. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: avahi-daemon 0.6.32~rc+dfsg-1ubuntu2 ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8 Uname: Linux 4.4.0-22-generic x86_64 ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 CurrentDesktop: Unity Date: Fri May 27 15:11:34 2016 InstallationDate: Installed on 2015-10-22 (218 days ago) InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) SourcePackage: avahi UpgradeStatus: Upgraded to xenial on 2016-03-30 (58 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1586528/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp