I think I am experiencing the same issue. This is a brand new desktop PC with 16.04 LTS installed from scratch i.e. not an upgrade from a previous version.
This is wired ethernet (GbE) i.e. not WiFi. Immediately after a boot, the user logs in and attempts to access a computer on the local network (so no possibility of internet problems and most likely no possibility of DNS problems). The attempt to use the network fails. ifconfig appears to show everything normal - ethernet is UP and an IP address is assigned. Icon at top right of screen appears to show everything normal (up-arrow-down-arrow icon is present). (IPv4 has an IP address assigned manually but the same malfunction was occurred when, initially, it was using DHCP, I think.) ping of a host on the local network fails. Wait about 25 seconds though and suddenly it's working. This is not good user interface because the user has no way of seeing when the network starts to work. It's not a good user experience either as the computer is working significantly before the network is usable. syslog from boot doesn't show anything obviously wrong - NetworkManager sees the ethernet and appears to bring it up - but then about a minute after the first message of the boot I see that NetworkManager reports that the link is disconnected and then connected. Don't know whether it matters but both IPv4 and IPv6 are in use. IPv6 uses DHCP. Once all the weirdness has finished, both IPv4 and IPv6 work correctly. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1434986 Title: Not working network connection after boot Status in NetworkManager: Expired Status in network-manager package in Ubuntu: Triaged Bug description: Directly after boot the network connections are not working. I am connected and have an IP address, but I cannot establish a connection with any Internet server. I have the impression it is related to thee DNS lookup, which waits forever for a result. Cycling the connection (disconnect->reconnect) seems to fix the problem for some time. I am reporting this against network-manager, but I am not sure if it is directly in network manager or if it is systemd related. With 14.10 everything worked perfectly. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: network-manager 0.9.10.0-4ubuntu11 ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1 Uname: Linux 3.19.0-9-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.16.2-0ubuntu4 Architecture: amd64 CurrentDesktop: GNOME Date: Sun Mar 22 12:38:26 2015 EcryptfsInUse: Yes IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback InstallationDate: Installed on 2015-01-30 (50 days ago) InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 (20141022.1) IpRoute: default via 192.168.1.1 dev eth0 proto static metric 1024 169.254.0.0/16 dev wlan0 scope link metric 1000 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.26 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.29 NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=true WWANEnabled=true WimaxEnabled=true ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=de_DE.UTF-8 SHELL=/bin/bash SourcePackage: network-manager UpgradeStatus: Upgraded to vivid on 2015-03-19 (3 days ago) modified.conffile..etc.NetworkManager.NetworkManager.conf: [modified] mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2015-02-16T00:14:50.662693 nmcli-dev: DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH eth0 ethernet connected /org/freedesktop/NetworkManager/Devices/2 Kabelnetzwerkverbindung 1 4a581685-6002-4401-a993-49aa649667eb /org/freedesktop/NetworkManager/ActiveConnection/4 wlan0 wifi connected /org/freedesktop/NetworkManager/Devices/1 4A616E7320574C414E f45aa3a7-fb44-41b7-a02a-ea9720d79414 /org/freedesktop/NetworkManager/ActiveConnection/3 lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/0 -- -- -- nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'. To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1434986/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
