[Bug 1691158] Re: systemd mounts efi partition, but /etc/fstab says "noauto"

[DLCBurggraaff]

Now imagine what happens when sda5 is mounted "behind my back" on /boot and a new kernel is installed by the Software Updater: the new kernel ends up on sda5 and the /vmlinuz and /initrd.img "system" symlinks point the new files.
On a reboot Grub does not mount sda5: the "system" symlinks point to non-existing files and Grub fails ...

The /var/log/messages file as provided shows that systemd mounts sda5 on
/boot and I really cannot think of a reason for that.

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Title:
  systemd mounts efi partition, but /etc/fstab says "noauto"

Status in systemd package in Ubuntu:
  New

Bug description:
  Systemd mounts /dev/sda5 on /boot despite the fact that /etc/fstab says:
      /dev/sda5 /boot ext2 noauto,relatime 0 0

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: systemd 229-4ubuntu17
  ProcVersionSignature: Ubuntu 4.8.0-52.55~16.04.1-generic 4.8.17
  Uname: Linux 4.8.0-52-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Tue May 16 17:58:49 2017
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz root=/dev/sda10 ro
  SourcePackage: systemd
  SystemdDelta:
   [EXTENDED]   /lib/systemd/system/rc-local.service → /lib/systemd/system/rc-local.service.d/debian.conf
   [EXTENDED]   /lib/systemd/system/systemd-timesyncd.service → /lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf
   
   2 overridden configuration files found.
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/25/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.20
  dmi.board.name: H110M-HDS
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.20:bd01/25/2016:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnH110M-HDS:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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