> 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: 
[  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 = 
[  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 
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/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


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  No network with e1000e driver on 4.13.0-38-generic

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