[Bug 1742310] Re: No network in recovery mode (systemd-resolved does not start)

[Steve Langasek]

** Package changed: systemd (Ubuntu) => friendly-recovery (Ubuntu)

** Changed in: friendly-recovery (Ubuntu)
   Importance: Undecided => High

** Changed in: friendly-recovery (Ubuntu)
       Status: New => Triaged

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Title:
  No network in recovery mode (systemd-resolved does not start)

Status in friendly-recovery package in Ubuntu:
  Triaged

Bug description:
  When booting into recovery mode and enabling networking, networking
  does not get enabled. DNS lookup doesn't work because systemd-resolved
  does not start and /etc/resolv.conf is a broken symlink.

  Steps to reproduce:

  1. Reboot.
  2. In the grub menu, select "Advanced options for Ubuntu" and then select boot in recovery mode.
  3. When the menu appears, select "networking". In the console you may notice a few errors that /etc/resolv.conf file not found.
  4. Select "drop to root" console.
  5. Try pinging some hosts, like "ping ubuntu.com". You will see that name resolution doesn't work.
  6. You can check that the network interface is up, "ip addr" displays valid info and the interface has an assigned local IP.
  7. You can check that /etc/resolv.conf is in fact a dangling link to ../run/resolvconf/resolv.conf.
  8. You can see that systemd-resolved is not running: "systemctl status systemd-resolved" shows the service is dead.
  9. Invoking "systemctl start systemd-resolved" hangs indefinitely, the service not starting.

  The workaround to get DNS working is to replace /etc/resolv.conf with
  a valid link or a file with a DNS server.

  The DNS lookup and networking in general works fine if the system is
  booted normally.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: systemd 234-2ubuntu12.1
  ProcVersionSignature: Ubuntu 4.13.0-21.24-generic 4.13.13
  Uname: Linux 4.13.0-21-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Wed Jan 10 02:18:14 2018
  InstallationDate: Installed on 2015-05-01 (984 days ago)
  InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: System manufacturer System Product Name
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-21-generic root=UUID=a03f1835-52f9-4409-9da7-fe45770637ae ro quiet splash nomdmonddf nomdmonisw
  SourcePackage: systemd
  SystemdDelta:
   [MASKED]     /etc/systemd/system/samba-ad-dc.service → /lib/systemd/system/samba-ad-dc.service
   [EXTENDED]   /lib/systemd/system/rc-local.service → /lib/systemd/system/rc-local.service.d/debian.conf
   [EXTENDED]   /lib/systemd/system/user at .service → /lib/systemd/system/user at .service.d/timeout.conf
   
   3 overridden configuration files found.
  UpgradeStatus: Upgraded to artful on 2017-11-03 (67 days ago)
  dmi.bios.date: 11/09/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3603
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8Z68-V PRO
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3603:bd11/09/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP8Z68-VPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  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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