I have the same bug on Wily; My network interface is called em1, it's the only one I have besides lo It was configured that way by the ubuntu installer. This machine was installed with 15.04 then upgraded to 15.10. The system's locale is French, in case it's relevant.
I think the interface name is why network-manager doesn't handle it. LANG=C apt-cache policy network-manager network-manager: Installed: 1.0.4-0ubuntu5.2 Candidate: 1.0.4-0ubuntu5.2 Version table: *** 1.0.4-0ubuntu5.2 0 500 http://fr.archive.ubuntu.com/ubuntu/ wily-updates/main amd64 Packages 100 /var/lib/dpkg/status 1.0.4-0ubuntu5 0 500 http://fr.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages LANG=C ifconfig em1 em1 Link encap:Ethernet HWaddr 74:d4:35:bb:e4:02 inet addr:192.168.0.1 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::76d4:35ff:febb:e402/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:8379619 errors:0 dropped:0 overruns:0 frame:0 TX packets:7880493 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:7041853239 (7.0 GB) TX bytes:6122637468 (6.1 GB) Interrupt:20 Memory:f7100000-f7120000 LANG=C lspci -k 00:00.0 Host bridge: Intel Corporation 4th Gen Core Processor DRAM Controller (rev 06) Subsystem: Gigabyte Technology Co., Ltd Device 5000 Kernel driver in use: hsw_uncore 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller (rev 06) Kernel driver in use: pcieport 00:14.0 USB controller: Intel Corporation 9 Series Chipset Family USB xHCI Controller Subsystem: Gigabyte Technology Co., Ltd Device 5007 Kernel driver in use: xhci_hcd 00:16.0 Communication controller: Intel Corporation 9 Series Chipset Family ME Interface #1 Subsystem: Gigabyte Technology Co., Ltd Device 1c3a Kernel driver in use: mei_me 00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-V DeviceName: Onboard LAN Subsystem: Gigabyte Technology Co., Ltd Device e000 Kernel driver in use: e1000e 00:1a.0 USB controller: Intel Corporation 9 Series Chipset Family USB EHCI Controller #2 Subsystem: Gigabyte Technology Co., Ltd Device 5006 Kernel driver in use: ehci-pci 00:1b.0 Audio device: Intel Corporation 9 Series Chipset Family HD Audio Controller Subsystem: Gigabyte Technology Co., Ltd Device a182 Kernel driver in use: snd_hda_intel 00:1c.0 PCI bridge: Intel Corporation 9 Series Chipset Family PCI Express Root Port 1 (rev d0) Kernel driver in use: pcieport 00:1c.3 PCI bridge: Intel Corporation 9 Series Chipset Family PCI Express Root Port 4 (rev d0) Kernel driver in use: pcieport 00:1d.0 USB controller: Intel Corporation 9 Series Chipset Family USB EHCI Controller #1 Subsystem: Gigabyte Technology Co., Ltd Device 5006 Kernel driver in use: ehci-pci 00:1f.0 ISA bridge: Intel Corporation 9 Series Chipset Family Z97 LPC Controller Subsystem: Gigabyte Technology Co., Ltd Device 5001 Kernel driver in use: lpc_ich 00:1f.2 SATA controller: Intel Corporation 9 Series Chipset Family SATA Controller [AHCI Mode] Subsystem: Gigabyte Technology Co., Ltd Device b005 Kernel driver in use: ahci 00:1f.3 SMBus: Intel Corporation 9 Series Chipset Family SMBus Controller Subsystem: Gigabyte Technology Co., Ltd Device 5001 01:00.0 VGA compatible controller: NVIDIA Corporation GM204 [GeForce GTX 970] (rev a1) Subsystem: Gigabyte Technology Co., Ltd Device 367a Kernel driver in use: nvidia 01:00.1 Audio device: NVIDIA Corporation GM204 High Definition Audio Controller (rev a1) Subsystem: Gigabyte Technology Co., Ltd Device 367a Kernel driver in use: snd_hda_intel 03:00.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 41) dmesg | grep e1000e [ 0.627987] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.5-k [ 0.628468] e1000e: Copyright(c) 1999 - 2015 Intel Corporation. [ 0.640803] e1000e 0000:00:19.0: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode [ 0.813883] e1000e 0000:00:19.0 eth0: registered PHC clock [ 0.814340] e1000e 0000:00:19.0 eth0: (PCI Express:2.5GT/s:Width x1) 74:d4:35:bb:e4:02 [ 0.814784] e1000e 0000:00:19.0 eth0: Intel(R) PRO/1000 Network Connection [ 0.815252] e1000e 0000:00:19.0 eth0: MAC: 11, PHY: 12, PBA No: FFFFFF-0FF [ 0.817595] e1000e 0000:00:19.0 em1: renamed from eth0 [ 4.719214] e1000e: em1 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None [ 4.719217] e1000e 0000:00:19.0 em1: 10/100 speed: disabling TSO -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1327610 Title: No valid active connection found and Unmanaged device found To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1327610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs