I have the same problem; syslog doesn't tell much, but kern.log tells a bit more - "something" is restarting NetworkManager, and the restart results in losing network connection(s); see below; I have standard ubuntu 16.04 LTS 64bit kept up-to-date as a VM within VirtualBox with Win7/64 host and the latest Vbox version (this had been happening across several Vbox updates; but on the same Vbox version, it wasn't happening on ubuntu 14.10 VM until I removed that and installed a brand new 16.04 from scratch). I hoped the 16.04 would soon get a patch fixing this but that never happened. I have both the host and the VM running 24/7 and the frequency of losing the network is about this - ignore November/14, that was obviously unusual and not related to the problem.
root@ostws0116886lu:~# LC_ALL=C egrep "whoopsi.*offline" /var/log/syslog* /var/log/syslog:Nov 22 15:57:38 ostws0116886lu whoopsie[617]: [15:57:38] offline /var/log/syslog:Nov 23 15:57:58 ostws0116886lu whoopsie[617]: [15:57:58] offline /var/log/syslog:Nov 25 09:21:11 ostws0116886lu whoopsie[617]: [09:21:11] offline /var/log/syslog.1:Nov 15 21:41:08 ostws0116886lu whoopsie[663]: [21:41:08] offline /var/log/syslog.1:Nov 16 22:02:29 ostws0116886lu whoopsie[663]: [22:02:29] offline root@ostws0116886lu:~# LC_ALL=C xzegrep "whoopsi.*offline" /var/log/syslog*.xz /var/log/syslog.2.xz:Nov 6 09:47:04 ostws0116886lu whoopsie[26233]: [09:47:04] offline /var/log/syslog.2.xz:Nov 9 08:03:06 ostws0116886lu whoopsie[637]: [08:03:06] offline /var/log/syslog.2.xz:Nov 9 08:04:43 ostws0116886lu whoopsie[640]: [08:04:43] offline /var/log/syslog.2.xz:Nov 10 15:57:30 ostws0116886lu whoopsie[685]: [15:57:30] offline /var/log/syslog.2.xz:Nov 14 10:02:59 ostws0116886lu whoopsie[641]: [10:02:59] offline /var/log/syslog.2.xz:Nov 14 10:03:31 ostws0116886lu whoopsie[626]: [10:03:31] offline /var/log/syslog.2.xz:Nov 14 10:25:23 ostws0116886lu whoopsie[721]: [10:25:23] offline /var/log/syslog.2.xz:Nov 14 10:26:02 ostws0116886lu whoopsie[618]: [10:26:02] offline /var/log/syslog.2.xz:Nov 14 10:26:25 ostws0116886lu whoopsie[656]: [10:26:25] offline /var/log/syslog.2.xz:Nov 14 10:46:50 ostws0116886lu whoopsie[663]: [10:46:50] offline /var/log/syslog.3.xz:Nov 2 11:53:15 ostws0116886lu whoopsie[666]: [11:53:15] offline /var/log/syslog.3.xz:Nov 3 11:53:26 ostws0116886lu whoopsie[666]: [11:53:26] offline /var/log/syslog.3.xz:Nov 4 12:02:52 ostws0116886lu whoopsie[666]: [12:02:52] offline /var/log/syslog.4.xz:Oct 25 02:02:43 ostws0116886lu whoopsie[693]: [02:02:43] offline /var/log/syslog.4.xz:Oct 27 15:45:18 ostws0116886lu whoopsie[693]: [15:45:18] offline /var/log/syslog.4.xz:Oct 28 10:21:56 ostws0116886lu whoopsie[647]: [10:21:56] offline /var/log/syslog.4.xz:Oct 29 10:22:09 ostws0116886lu whoopsie[647]: [10:22:09] offline kern.log: --- Nov 24 09:20:58 ostws0116886lu NetworkManager[632]: <info> [1479979258.9094] caught SIGTERM, shutting down normally. Nov 24 09:20:58 ostws0116886lu NetworkManager[632]: <info> [1479979258.9662] exiting (success) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.2438] NetworkManager (version 1.2.2) is starting... Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.2483] Read config: /etc/NetworkManager/NetworkManager.conf (etc: default-wifi-powersave-on.conf) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.2532] manager[0x24e21a0]: monitoring kernel firmware directory '/lib/firmware'. Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.2536] monitoring ifupdown state file '/run/network/ifstate'. Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.2603] dns-mgr[0x24f28b0]: set resolv-conf-mode: dnsmasq, plugin="dnsmasq" Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.2607] dns-mgr[0x24f28b0]: using resolv.conf manager 'resolvconf' Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3473] init! Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3521] management mode: unmanaged Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3523] devices added (path: /sys/devices/pci0000:00/0000:00:03.0/virtio0/net/enp0s3, iface: enp0s3) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3524] device added (path: /sys/devices/pci0000:00/0000:00:03.0/virtio0/net/enp0s3, iface: enp0s3): no ifupdown configuration found. Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3524] devices added (path: /sys/devices/virtual/net/lo, iface: lo) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3525] device added (path: /sys/devices/virtual/net/lo, iface: lo): no ifupdown configuration found. Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3525] end _init. Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3525] settings: loaded plugin ifupdown: (C) 2008 Canonical Ltd. To report bugs please use the NetworkManager mailing list. (/usr/lib/x86_64-linux-gnu/NetworkManager/libnm-settings-plugin-ifupdown.s o) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3526] settings: loaded plugin keyfile: (c) 2007 - 2015 Red Hat, Inc. To report bugs please use the NetworkManager mailing list. Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3530] SettingsPlugin-Ofono: init! Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <warn> [1479979259.3530] SettingsPlugin-Ofono: file doesn't exist: /var/lib/ofono Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3531] SettingsPlugin-Ofono: end _init. Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3531] settings: loaded plugin ofono: (C) 2013-2016 Canonical Ltd. To report bugs please use the NetworkManager mailing list. (/usr/lib/x86_64-linux-gnu/NetworkManager/libnm-settings-plugin-ofono.so ) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3531] (38818864) ... get_connections. Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3531] (38818864) ... get_connections (managed=false): return empty list. Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3559] SettingsPlugin-Ofono: (38819024) ... get_connections. Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3561] SettingsPlugin-Ofono: (38819024) connections count: 0 Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.3561] get unmanaged devices count: 0 Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4836] settings: hostname: using hostnamed Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4836] settings: hostname changed from (none) to "ostws0116886lu" Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4839] Using DHCP client 'dhclient' Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4839] manager: WiFi enabled by radio killswitch; enabled by state file Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4840] manager: WWAN enabled by radio killswitch; enabled by state file Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4840] manager: Networking is enabled by state file Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4840] Loaded device plugin: NMVxlanFactory (internal) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4841] Loaded device plugin: NMVlanFactory (internal) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4841] Loaded device plugin: NMVethFactory (internal) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4841] Loaded device plugin: NMTunFactory (internal) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4841] Loaded device plugin: NMMacvlanFactory (internal) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4841] Loaded device plugin: NMIPTunnelFactory (internal) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4842] Loaded device plugin: NMInfinibandFactory (internal) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4842] Loaded device plugin: NMEthernetFactory (internal) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4842] Loaded device plugin: NMBridgeFactory (internal) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4842] Loaded device plugin: NMBondFactory (internal) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4950] Loaded device plugin: NMWwanFactory (/usr/lib/x86_64-linux-gnu/NetworkManager/libnm-device-plugin-wwan.so) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.4990] Loaded device plugin: NMAtmManager (/usr/lib/x86_64-linux-gnu/NetworkManager/libnm-device-plugin-adsl.so) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5034] Loaded device plugin: NMWifiFactory (/usr/lib/x86_64-linux-gnu/NetworkManager/libnm-device-plugin-wifi.so) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5099] Loaded device plugin: NMBluezManager (/usr/lib/x86_64-linux-gnu/NetworkManager/libnm-device-plugin-bluetooth.so) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5109] device (enp0s3): link connected Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5120] manager: (enp0s3): new Ethernet device (/org/freedesktop/NetworkManager/Devices/0) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5143] keyfile: add connection in-memory (c4843ab8-a696-32e4-aace-39a02d637d6f,"Wired connection 1") Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5210] settings: (enp0s3): created default wired connection 'Wired connection 1' Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5226] device (enp0s3): state change: unmanaged -> unavailable (reason 'managed') [10 20 2] Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5264] device (lo): link connected Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5273] manager: (lo): new Generic device (/org/freedesktop/NetworkManager/Devices/1) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5430] urfkill disappeared from the bus Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5611] device (enp0s3): state change: unavailable -> disconnected (reason 'none') [20 30 0] Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5624] policy: auto-activating connection 'Wired connection 1' Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5661] device (enp0s3): Activation: starting connection 'Wired connection 1' (c4843ab8-a696-32e4-aace-39a02d637d6f) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5664] device (enp0s3): state change: disconnected -> prepare (reason 'none') [30 40 0] Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5667] manager: NetworkManager state is now CONNECTING Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5673] device (enp0s3): state change: prepare -> config (reason 'none') [40 50 0] Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5686] device (enp0s3): state change: config -> ip-config (reason 'none') [50 70 0] Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.5726] dhcp4 (enp0s3): activation: beginning transaction (timeout in 45 seconds) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.6192] dhcp4 (enp0s3): dhclient started with pid 3489 Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.6221] ofono is now available Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <warn> [1479979259.6234] failed to enumerate oFono devices: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.ofono was not provided by any .service files Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.6976] ModemManager available in the bus Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7212] address 10.0.2.15 Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7213] plen 24 (255.255.255.0) Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7213] gateway 10.0.2.2 Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7213] server identifier 10.0.2.2 Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7213] lease time 86400 Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7213] nameserver '172.20.220.26' Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7213] nameserver '172.20.220.25' Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7214] nameserver '10.5.212.21' Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7214] domain name 'bskyb.com' Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7214] dhcp4 (enp0s3): state changed unknown -> bound Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7225] device (enp0s3): state change: ip-config -> ip-check (reason 'none') [70 80 0] Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7242] device (enp0s3): state change: ip-check -> secondaries (reason 'none') [80 90 0] Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7246] device (enp0s3): state change: secondaries -> activated (reason 'none') [90 100 0] Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7248] manager: NetworkManager state is now CONNECTED_LOCAL Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7486] manager: NetworkManager state is now CONNECTED_GLOBAL Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7492] policy: set 'Wired connection 1' (enp0s3) as default for IPv4 routing and DNS Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7694] dns-plugin[0x24ee840]: starting dnsmasq... Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7735] dns-mgr: Writing DNS information to /sbin/resolvconf Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.7936] device (enp0s3): Activation: successful, device activated. Nov 24 09:20:59 ostws0116886lu NetworkManager[3470]: <info> [1479979259.8012] dnsmasq[0x24ee840]: dnsmasq appeared as :1.73 Nov 24 09:21:04 ostws0116886lu NetworkManager[3470]: <info> [1479979264.6393] manager: startup complete Nov 24 09:21:09 ostws0116886lu NetworkManager[3470]: <info> [1479979269.2874] WiFi hardware radio set enabled Nov 24 09:21:09 ostws0116886lu NetworkManager[3470]: <info> [1479979269.2875] WWAN hardware radio set enabled --- time-correlated syslog entries (no lines skipped within): --- Nov 25 09:17:01 ostws0116886lu CRON[13480]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) Nov 25 09:21:10 ostws0116886lu avahi-daemon[662]: Withdrawing address record for 10.0.2.15 on enp0s3. Nov 25 09:21:10 ostws0116886lu avahi-daemon[662]: Leaving mDNS multicast group on interface enp0s3.IPv4 with address 10.0.2.15. Nov 25 09:21:10 ostws0116886lu avahi-daemon[662]: Interface enp0s3.IPv4 no longer relevant for mDNS. Nov 25 09:21:11 ostws0116886lu whoopsie[617]: [09:21:11] Cannot reach: https://daisy.ubuntu.com Nov 25 09:21:11 ostws0116886lu whoopsie[617]: [09:21:11] offline -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to avahi 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
