> Martin, I can confirm the issue. It's a regression introduced by LP: #1730550.
> 
> Commit 4110e02eb45ea447ec6f5459c9934de0a273fb91 can solve the issue for me, 
> please verify if it also fixes issue for you.
> 
> I built an Artful kernel with the commit:
> https://people.canonical.com/~khfeng/lp1762693/

Yep, that seems to be it; the new kernel is working fine, and no more
dmesg errors!

martin@dogmeat ~ % dmesg | tail    
[   13.080188] VBoxNetAdp: Successfully started.
[   13.084844] VBoxPciLinuxInit
[   13.087407] vboxpci: IOMMU not found (not registered)
[   13.463759] ahci 0000:00:17.0: port does not support device sleep
[   14.990341] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: 
None
[  842.053183] Could not find key with description: [459a10809c211381]
[  842.053190] process_request_key_err: No key
[  842.053191] Could not find valid key in user session keyring for sig 
specified in mount option: [459a10809c211381]
[  842.053192] One or more global auth toks could not properly register; rc = 
[-2]
[  842.053194] Error parsing options; rc = [-2]
martin@dogmeat ~ % cat /proc/uptime 
886.29 3486.40
martin@dogmeat ~ % uname -a
Linux dogmeat 4.13.0-39-generic #44~lp1762693 SMP Wed Apr 11 12:06:10 CST 2018 
x86_64 x86_64 x86_64 GNU/Linux
martin@dogmeat ~ % sudo ethtool eth0
[sudo] Passwort für martin: 
Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: off (auto)
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes

Thanks!

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https://bugs.launchpad.net/bugs/1762693

Title:
  No network with e1000e driver on 4.13.0-38-generic

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  When my computer boots with the most recent kernel 4.13.0-38-generic,
  I don't have a working network connection. ethtool reports that my
  network interface doesn't have a connection:

  martin@dogmeat ~ % cat ethtool.txt 
  Settings for eth0:
          Supported ports: [ TP ]
          Supported link modes:   10baseT/Half 10baseT/Full 
                                  100baseT/Half 100baseT/Full 
                                  1000baseT/Full 
          Supported pause frame use: No
          Supports auto-negotiation: Yes
          Advertised link modes:  10baseT/Half 10baseT/Full 
                                  100baseT/Half 100baseT/Full 
                                  1000baseT/Full 
          Advertised pause frame use: No
          Advertised auto-negotiation: Yes
          Speed: Unknown!
          Duplex: Unknown! (255)
          Port: Twisted Pair
          PHYAD: 2
          Transceiver: internal
          Auto-negotiation: on
          MDI-X: Unknown (auto)
          Supports Wake-on: pumbg
          Wake-on: g
          Current message level: 0x00000007 (7)
                                 drv probe link
          Link detected: no

  dmesg contains suspicious e1000e error messages:

  martin@dogmeat ~ % tail -n 40 dmesg.txt
  [   20.211715] Could not find valid key in user session keyring for sig 
specified in mount option: [459a10809c211381]
  [   20.211716] One or more global auth toks could not properly register; rc = 
[-2]
  [   20.211717] Error parsing options; rc = [-2]
  [   25.824466] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow 
Control: None
  [   25.969587] e1000e 0000:00:1f.6 eth0: changing MTU from 1500 to 1492
  [   30.034472] e1000e 0000:00:1f.6 eth0: changing MTU from 1492 to 1500
  [   35.808558] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow 
Control: None
  [   35.939670] e1000e 0000:00:1f.6 eth0: changing MTU from 1500 to 1492
  [   40.037526] e1000e 0000:00:1f.6 eth0: changing MTU from 1492 to 1500
  [   46.048494] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow 
Control: None
  [   46.263237] e1000e 0000:00:1f.6 eth0: changing MTU from 1500 to 1492
  [   51.022052] e1000e 0000:00:1f.6 eth0: changing MTU from 1492 to 1500
  [   51.244686] ahci 0000:00:17.0: port does not support device sleep
  [   56.800544] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow 
Control: None
  [   56.935347] e1000e 0000:00:1f.6 eth0: changing MTU from 1500 to 1492
  [   61.036903] e1000e 0000:00:1f.6 eth0: changing MTU from 1492 to 1500
  [   67.040536] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow 
Control: None
  [   67.199669] e1000e 0000:00:1f.6 eth0: changing MTU from 1500 to 1492
  [   72.038713] e1000e 0000:00:1f.6 eth0: changing MTU from 1492 to 1500
  [   78.048576] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow 
Control: None
  [   78.170825] e1000e 0000:00:1f.6 eth0: changing MTU from 1500 to 1492
  [   83.038119] e1000e 0000:00:1f.6 eth0: changing MTU from 1492 to 1500
  [   88.800521] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow 
Control: None
  [   88.938939] e1000e 0000:00:1f.6 eth0: changing MTU from 1500 to 1492
  [   93.021350] e1000e 0000:00:1f.6 eth0: changing MTU from 1492 to 1500
  [   99.040543] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow 
Control: None
  [   99.163603] e1000e 0000:00:1f.6 eth0: changing MTU from 1500 to 1492
  [  104.038668] e1000e 0000:00:1f.6 eth0: changing MTU from 1492 to 1500
  [  110.048532] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow 
Control: None
  [  110.191137] e1000e 0000:00:1f.6 eth0: changing MTU from 1500 to 1492
  [  115.022823] e1000e 0000:00:1f.6 eth0: changing MTU from 1492 to 1500
  [  120.800524] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow 
Control: None
  [  120.910537] e1000e 0000:00:1f.6 eth0: changing MTU from 1500 to 1492
  [  125.019509] e1000e 0000:00:1f.6 eth0: changing MTU from 1492 to 1500
  [  131.040530] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow 
Control: None
  [  131.164741] e1000e 0000:00:1f.6 eth0: changing MTU from 1500 to 1492
  [  136.039268] e1000e 0000:00:1f.6 eth0: changing MTU from 1492 to 1500
  [  142.048536] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow 
Control: None
  [  142.186891] e1000e 0000:00:1f.6 eth0: changing MTU from 1500 to 1492
  [  147.038361] e1000e 0000:00:1f.6 eth0: changing MTU from 1492 to 1500

  Everything works fine when I boot Linux 4.13.0-37-generic.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-38-generic 4.13.0-38.43
  ProcVersionSignature: Ubuntu 4.13.0-38.43-generic 4.13.16
  Uname: Linux 4.13.0-38-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  martin     2756 F.... pulseaudio
  CurrentDesktop: MATE
  Date: Tue Apr 10 11:34:19 2018
  EcryptfsInUse: Yes
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
  MachineType: System manufacturer System Product Name
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-38-generic 
root=UUID=8ee32f29-87ea-4229-8807-35171b6dfeed ro quiet splash nomdmonddf 
nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw 
vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-38-generic N/A
   linux-backports-modules-4.13.0-38-generic  N/A
   linux-firmware                             1.169.3
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to artful on 2018-01-23 (76 days ago)
  dmi.bios.date: 09/20/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2002
  dmi.board.asset.tag: Default string
  dmi.board.name: H170-PRO/USB 3.1
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr2002:bd09/20/2016:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH170-PRO/USB3.1:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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