[Bug 1682637] Re: during recovery mode, enable network failed due to /etc/resolv.conf not being present

[Eric Desrochers]

@xnox,

I have notice a block in Bionic when choosing 'Enable Network' option in
recovery mode on different bionic vanilla system and I can reproduce all
the time.

I also asked colleagues to give it a try (for a second pair of eye on
this) and they have the same result as me.

Basically, when choosing 'Enable Network' the user got block or lock. 
If we hit 'ctrl-c', then a shell arrive and the system has network connectivity.

Here's my colleague observation about this behaviour so far :

"
I also observe a lock. Plus I enabled the systemd debug-shell so I got some info:

pstree:

    systemd(1)-+-bash(391)---pstree(928)
               |-lvmetad(438)
               |-recovery-menu(711)---network(897)---systemctl(899)---systemd-tty-ask(900)
               |-systemd-journal(406)
               `-systemd-udevd(432)


I also observed that the behavior is the same with and without /e/n/i config, so it's not related to the config itself most likely.

So I also straced the systemd-tty-ask process:

    strace: Process 900 attached
    restart_syscall(<... resuming interrupted restart_syscall ...>
"

-- 
You received this bug notification because you are a member of Ubuntu
Sponsors Team, which is subscribed to the bug report.
https://bugs.launchpad.net/bugs/1682637

Title:
  during recovery mode, enable network failed due to /etc/resolv.conf
  not being present

Status in friendly-recovery package in Ubuntu:
  Fix Released
Status in friendly-recovery source package in Xenial:
  In Progress
Status in friendly-recovery source package in Artful:
  In Progress
Status in friendly-recovery source package in Bionic:
  Fix Released

Bug description:
  Something went wrong that required me to boot to recovery mode via
  grub.  The important part here, is that while I got as far as the
  recovery screen asking to "Enable Networking" and other options fsck
  filesystems, drop to root shell, etc.

  and selected "Enable Networking":

  the result was:

  grep: /etc/resolv.conf: No such File or directory.

  Unknown group "power" in message bus configuration file.


  (Networking did not enable, leaving me stranded at root shell without
  network which would have made adding/removing packages to troubleshoot
  easier)

  Ubuntu: zesty 17.04
  Linux: Linux Hedy 4.10.0-19-generic #21-Ubuntu SMP Thu Apr 6 17:04:57 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
  network-manager: 1.4.4-1ubuntu3

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: network-manager 1.4.4-1ubuntu3
  ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
  Uname: Linux 4.10.0-19-generic x86_64
  ApportVersion: 2.20.4-0ubuntu4
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Thu Apr 13 16:40:19 2017
  EcryptfsInUse: Yes
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2014-07-09 (1009 days ago)
  InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 (20140708)
  IpRoute:
   default via 192.168.250.1 dev wlan1 proto static metric 600 
   10.0.3.0/24 dev lxcbr0 proto kernel scope link src 10.0.3.1 linkdown 
   169.254.0.0/16 dev lxcbr0 scope link metric 1000 linkdown 
   192.168.250.0/24 dev wlan1 proto kernel scope link src 192.168.250.3 metric 600
  NetworkManager.conf:
   [main]
   plugins=ifupdown,keyfile
   
   [ifupdown]
   managed=false
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=false
  SourcePackage: network-manager
  UpgradeStatus: Upgraded to zesty on 2017-04-13 (0 days ago)
  nmcli-dev:
   DEVICE  TYPE      STATE        DBUS-PATH                                  CONNECTION      CON-UUID                              CON-PATH                                           
   lxcbr0  bridge    connected    /org/freedesktop/NetworkManager/Devices/3  lxcbr0          46595dd8-757b-4d93-ade3-c066f72d9e2e  /org/freedesktop/NetworkManager/ActiveConnection/0 
   wlan1   wifi      connected    /org/freedesktop/NetworkManager/Devices/2  Brisbane House  2b25e748-f9c5-4c84-9fe6-0f64071fcf0b  /org/freedesktop/NetworkManager/ActiveConnection/1 
   eth1    ethernet  unavailable  /org/freedesktop/NetworkManager/Devices/1  --              --                                    --                                                 
   lo      loopback  unmanaged    /org/freedesktop/NetworkManager/Devices/0  --              --                                    --
  nmcli-nm:
   RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  WIFI     WWAN-HW  WWAN     
   running  1.4.4    connected  started  full          enabled     enabled  enabled  enabled  disabled

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/friendly-recovery/+bug/1682637/+subscriptions