[Bug 1586528] Re: Avahi-daemon withdraws address record

Graham Bosworth 1586528 at bugs.launchpad.net
Tue Aug 22 17:05:39 UTC 2017


I am seeing the same problem on a physical host running Linux Mint.  I
too have found that clicking the network icon to toggle it off and back
on can restore connections.  Additionally, I have found that the
connection may be restored without intervention, given sufficient time
(potentially hours).  Sorry that this is a long post - when trying to
add an attachment, the U.R.L. was not found.  I have tried to provide
anything that may be relevant.  The connection was lost at 03:57:51, and
regained at 04:24.

The computers featured are yoyo, 192.168.42.187, 00:25:64:72:72:14, the
Linux Mint computer, and kevin, 192.168.42.129, 00:50:04:23:f7:80, the
D.H.C.P. server and Internet gateway.


[LinuxMint] graham at yoyo $ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
Tue Aug 22 17:57:47 ~

[LinuxMint] graham at yoyo $ lspci | grep -i "net"
09:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8040 PCI-E Fast Ethernet Controller (rev 13)
0c:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)
Tue Aug 22 17:59:23 ~

The Broadcom wireless adaptor is not active.

[LinuxMint] graham at yoyo $ cat /etc/os-release
NAME="Linux Mint"
VERSION="18 (Sarah)"
ID=linuxmint
ID_LIKE=ubuntu
PRETTY_NAME="Linux Mint 18"
VERSION_ID="18"
HOME_URL="http://www.linuxmint.com/"
SUPPORT_URL="http://forums.linuxmint.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/linuxmint/"
UBUNTU_CODENAME=xenial
Tue Aug 22 17:48:57 ~

[LinuxMint] graham at yoyo $ uname -a
Linux yoyo 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Tue Aug 22 18:04:00 ~


Here is a excerpt from kern.log, showing that the D.H.C.P. lease was not renewed and the network connection was lost:-
Aug 21 03:00:30 yoyo NetworkManager[1049]: <info>  [1503280830.6457] dhcp4 (eth0): state changed bound -> bound
Aug 21 03:13:25 yoyo NetworkManager[1049]: <info>  [1503281605.4009]   address 192.168.42.187
Aug 21 03:13:25 yoyo NetworkManager[1049]: <info>  [1503281605.4009]   plen 25 (255.255.255.128)
Aug 21 03:13:25 yoyo NetworkManager[1049]: <info>  [1503281605.4010]   gateway 192.168.42.129
Aug 21 03:13:25 yoyo NetworkManager[1049]: <info>  [1503281605.4010]   server identifier 192.168.42.129
Aug 21 03:13:25 yoyo NetworkManager[1049]: <info>  [1503281605.4010]   lease time 1800
Aug 21 03:13:25 yoyo NetworkManager[1049]: <info>  [1503281605.4010]   nameserver '192.168.42.129'
Aug 21 03:13:25 yoyo NetworkManager[1049]: <info>  [1503281605.4011]   nameserver '192.168.42.248'
Aug 21 03:13:25 yoyo NetworkManager[1049]: <info>  [1503281605.4011]   domain name 'example.net'
Aug 21 03:13:25 yoyo NetworkManager[1049]: <info>  [1503281605.5497] dhcp4 (eth0
): state changed bound -> bound
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5210]   address 192.168.42.187
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5211]   plen 25 (255.255.255.128)
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5211]   gateway 192.168.42.129
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5211]   server identifier 192.168.42.129
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5212]   lease time 1800
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5212]   nameserver '192.168.42.129'
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5212]   nameserver '192.168.42.248'
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5212]   domain name 'example.net'
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5213] dhcp4 (eth0): state changed bound -> bound
Aug 21 04:00:55 yoyo kernel: [2364015.580056] nfs: server gerald not responding, timed out
Aug 21 04:03:55 yoyo kernel: [2364195.804051] nfs: server gerald not responding, timed out

Here is a (slightly edited) excerpt from the same period in syslog:-
Aug 21 03:27:48 yoyo dhclient[6325]: DHCPREQUEST of 192.168.42.187 on eth0 to 192.168.42.129 port 67 (xid=0x4ce954e5)
Aug 21 03:27:48 yoyo dhclient[6325]: DHCPACK of 192.168.42.187 from 192.168.42.129
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5210]   address 192.168.42.187
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5211]   plen 25 (255.255.255.128)
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5211]   gateway 192.168.42.129
Aug 21 03:27:49 yoyo dhclient[6325]: bound to 192.168.42.187 -- renewal in 868 seconds.
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5211]   server identifier 192.168.42.129
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5212]   lease time 1800
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5212]   nameserver '192.168.42.129'
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5212]   nameserver '192.168.42.248'
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5212]   domain name 'example.net'
Aug 21 03:27:49 yoyo NetworkManager[1049]: <info>  [1503282469.5213] dhcp4 (eth0): state changed bound -> bound
Aug 21 03:27:49 yoyo dbus[999]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedes
ktop.nm-dispatcher.service'
Aug 21 03:27:50 yoyo systemd[1]: Starting Network Manager Script Dispatcher Service...
Aug 21 03:27:50 yoyo dbus[999]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Aug 21 03:27:50 yoyo systemd[1]: Started Network Manager Script Dispatcher Service.
Aug 21 03:27:50 yoyo nm-dispatcher: req:1 'dhcp4-change' [eth0]: new request (1 scripts)
Aug 21 03:27:50 yoyo nm-dispatcher: req:1 'dhcp4-change' [eth0]: start running ordered scripts...
Aug 21 03:34:01 yoyo CRON[1817]: (root) CMD (/usr/local/bin/enat-jobs/enat.MemStats /root/.enat/last.enat.MemStats)
Aug 21 03:34:01 yoyo MemStats: Memory used: 3005504KiB (75.01%), swap used: 1759248KiB (21.97%), loads:  2.19, 1.89, 1.92, net: 383 B/s in, 222 B/s out
Aug 21 03:42:17 yoyo dhclient[6325]: DHCPREQUEST of 192.168.42.187 on eth0 to 192.168.42.129 port 67 (xid=0x4ce954e5)
Aug 21 03:42:17 yoyo dhclient[6325]: DHCPACK of 192.168.42.187 from 192.168.42.129
Aug 21 03:42:18 yoyo dhclient[6325]: bound to 192.168.42.187 -- renewal in 728 seconds.
Aug 21 03:54:25 yoyo dhclient[6325]: DHCPREQUEST of 192.168.42.187 on eth0 to 192.168.42.129 port 67 (xid=0x4ce954e5)
Aug 21 03:54:25 yoyo dhclient[6325]: DHCPACK of 192.168.42.187 from 192.168.42.129
Aug 21 03:54:26 yoyo dhclient[6325]: bound to 192.168.42.187 -- renewal in 775 seconds.
Aug 21 03:57:50 yoyo avahi-daemon[1017]: Withdrawing address record for 192.168.42.187 on eth0.
Aug 21 03:57:50 yoyo rsyslogd-2359: action 'action 18' resumed (module 'builtin:omfwd') [v8.16.0 try http://www.rsyslog.com/e/2359 ]
Aug 21 03:57:50 yoyo avahi-daemon[1017]: Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.42.187.
Aug 21 03:57:50 yoyo avahi-daemon[1017]: Interface eth0.IPv4 no longer relevant for mDNS.
Aug 21 03:57:51 yoyo ntpd[6912]: Deleting interface #3 eth0, 192.168.42.187#123, interface stats: received=1649, sent=1923, dropped=0, active_time=88923 secs
Aug 21 03:57:51 yoyo ntpd[6912]: 178.62.250.107 local addr 192.168.42.187 -> <null>
Aug 21 03:57:51 yoyo ntpd[6912]: 134.0.16.1 local addr 192.168.42.187 -> <null>

Later, the connection was discovered again (syslog):-
Aug 21 04:20:06 yoyo dhclient[6325]: dhclient.c:2386: Failed to send 300 byte long packet over fallback interface.
Aug 21 04:20:23 yoyo dhclient[6325]: DHCPREQUEST of 192.168.42.187 on eth0 to 192.168.42.129 port 67 (xid=0x4ce954e5)
Aug 21 04:20:23 yoyo dhclient[6325]: send_packet: Network is unreachable
Aug 21 04:20:23 yoyo dhclient[6325]: send_packet: please consult README file regarding broadcast address.
Aug 21 04:20:23 yoyo dhclient[6325]: dhclient.c:2386: Failed to send 300 byte long packet over fallback interface.
Aug 21 04:20:41 yoyo dhclient[6325]: DHCPREQUEST of 192.168.42.187 on eth0 to 255.255.255.255 port 67 (xid=0x4ce954e5)
Aug 21 04:22:25 yoyo kernel: [2365305.788044] nfs: server gerald not responding, timed out
Aug 21 04:22:30 yoyo kernel: [2365310.796047] nfs: server gerald not responding, timed out
Aug 21 04:24:19 yoyo dhclient[6325]: message repeated 17 times: [ DHCPREQUEST of 192.168.42.187 on eth0 to 255.255.255.255 port 67 (xid=0x4ce954e5)]
Aug 21 04:24:27 yoyo dhclient[6325]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3 (xid=0xb9ab7008)
Aug 21 04:24:27 yoyo dhclient[6325]: DHCPREQUEST of 192.168.42.187 on eth0 to 255.255.255.255 port 67 (xid=0x870abb9)
Aug 21 04:24:27 yoyo dhclient[6325]: DHCPOFFER of 192.168.42.187 from 192.168.42.129
Aug 21 04:24:27 yoyo rsyslogd-2359: message repeated 9 times: [action 'action 18' resumed (module 'builtin:omfwd') [v8.16.0 try http
://www.rsyslog.com/e/2359 ]]
Aug 21 04:24:27 yoyo rsyslogd-2007: action 'action 18' suspended, next retry is Mon Aug 21 04:24:57 2017 [v8.16.0 try http://www.rsy
slog.com/e/2007 ]
Aug 21 04:24:27 yoyo dhclient[6325]: DHCPACK of 192.168.42.187 from 192.168.42.129
Aug 21 04:24:27 yoyo NetworkManager[1049]: <info>  [1503285867.5744] dhcp4 (eth0): state changed bound -> expire
Aug 21 04:24:27 yoyo NetworkManager[1049]: <info>  [1503285867.7381] dhcp4 (eth0): canceled DHCP transaction, DHCP client pid 6325
Aug 21 04:24:27 yoyo NetworkManager[1049]: <info>  [1503285867.7381] dhcp4 (eth0): state changed expire -> done
Aug 21 04:24:27 yoyo NetworkManager[1049]: <info>  [1503285867.8850] device (eth0): state change: activated -> failed (reason 'ip-co
nfig-expired') [100 120 6]
Aug 21 04:24:27 yoyo NetworkManager[1049]: <info>  [1503285867.9286] manager: NetworkManager state is now CONNECTED_LOCAL
Aug 21 04:24:27 yoyo NetworkManager[1049]: <info>  [1503285867.9290] manager: NetworkManager state is now DISCONNECTED
Aug 21 04:24:28 yoyo NetworkManager[1049]: <warn>  [1503285868.4069] device (eth0): Activation: failed for connection 'Wired connection 1'
Aug 21 04:24:29 yoyo dbus[999]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
Aug 21 04:24:29 yoyo NetworkManager[1049]: <warn>  [1503285869.8415] (pid 6325) unhandled DHCP event for interface eth0
Aug 21 04:24:29 yoyo NetworkManager[1049]: <warn>  [1503285869.8420] (pid 6325) unhandled DHCP event for interface eth0
Aug 21 04:24:29 yoyo systemd[1]: Starting Network Manager Script Dispatcher Service...
Aug 21 04:24:30 yoyo NetworkManager[1049]: <info>  [1503285870.0385] device (eth0): state change: failed -> disconnected (reason 'none') [120 30 0]
Aug 21 04:24:30 yoyo avahi-daemon[1017]: Withdrawing address record for fe80::c1e6:4b25:5c64:f669 on eth0.
Aug 21 04:24:30 yoyo avahi-daemon[1017]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::c1e6:4b25:5c64:f669.
Aug 21 04:24:30 yoyo avahi-daemon[1017]: Interface eth0.IPv6 no longer relevant for mDNS.
Aug 21 04:24:30 yoyo NetworkManager[1049]: <info>  [1503285870.7254] dns-mgr: Writing DNS information to /sbin/resolvconf
Aug 21 04:24:30 yoyo dnsmasq[1364]: setting upstream servers from DBus
Aug 21 04:24:31 yoyo ntpd[6912]: Deleting interface #5 eth0, fe80::c1e6:4b25:5c64:f669%2#123, interface stats: received=0, sent=0, dropped=0, active_time=90523 secs
Aug 21 04:24:31 yoyo dbus[999]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'

Meanwhile, from the D.H.C.P. server:-
2017-08-21T03:13:24+01:00 kevin dhcpd[3454]: DHCPREQUEST for 192.168.42.187 from 00:25:64:72:72:14 (yoyo) via enp0s19
2017-08-21T03:13:24+01:00 kevin dhcpd[3454]: DHCPACK on 192.168.42.187 to 00:25:64:72:72:14 (yoyo) via enp0s19
...
2017-08-21T03:27:48+01:00 kevin dhcpd[3454]: DHCPREQUEST for 192.168.42.187 from 00:25:64:72:72:14 (yoyo) via enp0s19
2017-08-21T03:27:48+01:00 kevin dhcpd[3454]: DHCPACK on 192.168.42.187 to 00:25:64:72:72:14 (yoyo) via enp0s19
...
2017-08-21T03:42:17+01:00 kevin dhcpd[3454]: DHCPREQUEST for 192.168.42.187 from 00:25:64:72:72:14 (yoyo) via enp0s19
2017-08-21T03:42:17+01:00 kevin dhcpd[3454]: DHCPACK on 192.168.42.187 to 00:25:64:72:72:14 (yoyo) via enp0s19
...
2017-08-21T03:54:25+01:00 kevin dhcpd[3454]: DHCPREQUEST for 192.168.42.187 from 00:25:64:72:72:14 (yoyo) via enp0s19
2017-08-21T03:54:25+01:00 kevin dhcpd[3454]: DHCPACK on 192.168.42.187 to 00:25:64:72:72:14 (yoyo) via enp0s19
...
2017-08-21T03:57:51+01:00 kevin dhcpcd[2941]: enp0s19: hardware address 00:25:64:72:72:14 claims 192.168.42.129
2017-08-21T03:57:51+01:00 kevin kernel: IPv4: martian source 192.168.42.129 from 0.0.0.0, on dev enp0s19
2017-08-21T03:57:51+01:00 kevin kernel: ll header: 00000000: 00 50 04 23 f7 80 00 25 64 72 72 14 08 00        .P.#...%drr...
2017-08-21T03:57:52+01:00 kevin kernel: IPv4: martian source 192.168.42.129 from 0.0.0.0, on dev enp0s19
2017-08-21T03:57:52+01:00 kevin kernel: ll header: 00000000: 00 50 04 23 f7 80 00 25 64 72 72 14 08 00        .P.#...%drr...
2017-08-21T03:57:56+01:00 kevin kernel: IPv4: martian source 192.168.42.129 from 0.0.0.0, on dev enp0s19
2017-08-21T03:57:56+01:00 kevin kernel: ll header: 00000000: 00 50 04 23 f7 80 00 25 64 72 72 14 08 00        .P.#...%drr...
...
2017-08-21T04:21:24+01:00 kevin kernel: IPv4: martian source 192.168.42.129 from 0.0.0.0, on dev enp0s19
2017-08-21T04:21:24+01:00 kevin kernel: ll header: 00000000: 00 50 04 23 f7 80 00 25 64 72 72 14 08 00        .P.#...%drr...
2017-08-21T04:21:26+01:00 kevin dhcpd[3454]: reuse_lease: lease age 44 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.42.187
2017-08-21T04:21:26+01:00 kevin dhcpd[3454]: DHCPREQUEST for 192.168.42.187 from 00:25:64:72:72:14 via enp0s19
2017-08-21T04:21:26+01:00 kevin dhcpd[3454]: DHCPACK on 192.168.42.187 to 00:25:64:72:72:14 via enp0s19
2017-08-21T04:21:26+01:00 kevin kernel: IPv4: martian source 192.168.42.129 from 0.0.0.0, on dev enp0s19
2017-08-21T04:21:26+01:00 kevin kernel: ll header: 00000000: 00 50 04 23 f7 80 00 25 64 72 72 14 08 00        .P.#...%drr...
2017-08-21T04:21:27+01:00 kevin kernel: IPv4: martian source 192.168.42.129 from 0.0.0.0, on dev enp0s19
...
2017-08-21T04:21:33+01:00 kevin kernel: IPv4: martian source 192.168.42.129 from 0.0.0.0, on dev enp0s19
2017-08-21T04:21:33+01:00 kevin kernel: ll header: 00000000: 00 50 04 23 f7 80 00 25 64 72 72 14 08 00        .P.#...%drr...
2017-08-21T04:21:33+01:00 kevin sm-mta[4212]: v7L3LXQA004211: to=graham, ctladdr=<root at kevin.example.net> (0/0), delay=00:00:00, xdelay=00:00:00, mailer=smtp, pri=30598, relay=gerald.example.net. [192.168.42.248], dsn=2.0.0, stat=Sent (Ok: queued as 96C66E5472)
2017-08-21T04:21:34+01:00 kevin dhcpd[3454]: reuse_lease: lease age 52 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.42.187
2017-08-21T04:21:34+01:00 kevin dhcpd[3454]: DHCPREQUEST for 192.168.42.187 from 00:25:64:72:72:14 via enp0s19
2017-08-21T04:21:34+01:00 kevin dhcpd[3454]: DHCPACK on 192.168.42.187 to 00:25:64:72:72:14 via enp0s19
2017-08-21T04:21:34+01:00 kevin kernel: IPv4: martian source 192.168.42.129 from 0.0.0.0, on dev enp0s19
2017-08-21T04:21:34+01:00 kevin kernel: ll header: 00000000: 00 50 04 23 f7 80 00 25 64 72 72 14 08 00        .P.#...%drr...
2017-08-21T04:21:37+01:00 kevin kernel: IPv4: martian source 192.168.42.129 from 0.0.0.0, on dev enp0s19
...
2017-08-21T04:21:54+01:00 kevin kernel: IPv4: martian source 192.168.42.129 from 0.0.0.0, on dev enp0s19
2017-08-21T04:21:54+01:00 kevin kernel: ll header: 00000000: 00 50 04 23 f7 80 00 25 64 72 72 14 08 00        .P.#...%drr...
2017-08-21T04:21:55+01:00 kevin dhcpd[3454]: reuse_lease: lease age 73 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.42.187
2017-08-21T04:21:55+01:00 kevin dhcpd[3454]: DHCPREQUEST for 192.168.42.187 from 00:25:64:72:72:14 via enp0s19
2017-08-21T04:21:55+01:00 kevin dhcpd[3454]: DHCPACK on 192.168.42.187 to 00:25:64:72:72:14 via enp0s19
2017-08-21T04:21:57+01:00 kevin kernel: IPv4: martian source 192.168.42.129 from 0.0.0.0, on dev enp0s19
2017-08-21T04:21:57+01:00 kevin kernel: ll header: 00000000: 00 50 04 23 f7 80 00 25 64 72 72 14 08 00        .P.#...%drr...
... and several more, similar episodes ...
2017-08-21T04:24:30+01:00 kevin kernel: IPv4: martian source 192.168.42.129 from 0.0.0.0, on dev enp0s19
2017-08-21T04:24:30+01:00 kevin kernel: ll header: 00000000: 00 50 04 23 f7 80 00 25 64 72 72 14 08 00        .P.#...%drr...
2017-08-21T04:24:30+01:00 kevin dhcpcd[2941]: enp0s18: requesting DHCPv6 information
2017-08-21T04:24:36+01:00 kevin dhcpd[3454]: reuse_lease: lease age 234 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.42.187
2017-08-21T04:24:36+01:00 kevin dhcpd[3454]: DHCPDISCOVER from 00:25:64:72:72:14 via enp0s19
2017-08-21T04:24:36+01:00 kevin dhcpd[3454]: DHCPOFFER on 192.168.42.187 to 00:25:64:72:72:14 via enp0s19
2017-08-21T04:24:36+01:00 kevin dhcpd[3454]: reuse_lease: lease age 234 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.42.187
2017-08-21T04:24:36+01:00 kevin dhcpd[3454]: DHCPREQUEST for 192.168.42.187 (192.168.42.129) from 00:25:64:72:72:14 via enp0s19
2017-08-21T04:24:36+01:00 kevin dhcpd[3454]: DHCPACK on 192.168.42.187 to 00:25:64:72:72:14 via enp0s19

I hope that this is sufficient, but I could provide more details if necessary.
Thanks for your time.

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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:
  Confirmed

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)

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