[Bug 1770940] [NEW] Kexec reboot doesn't work on 18.04 non-EFI system

[MegaBrutal]

Public bug reported:

Unclear whether to report it against kexec-tools or systemd.

After upgrading to Ubuntu 18.04, the „systemctl kexec” command gives the following error message:
Cannot find the ESP partition mount point.

What's interesting is that strace shows that systemctl tries to find the
EFI partition before it emits the error message, like it was expecting
an EFI system. My laptop is not capable of EFI, and it wasn't a problem
for previous Ubuntu releases – the „systemctl kexec” command worked fine
before.

Here is my systemd version:

root at thinkpad:~# systemd --version
systemd 237
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid

And my kexec-tools version is 1:2.0.16-1ubuntu1.

I attached an strace output.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: kexec-tools 1:2.0.16-1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun May 13 12:48:25 2018
InstallationDate: Installed on 2014-06-10 (1432 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=hu_HU.UTF-8
 SHELL=/bin/bash
SourcePackage: kexec-tools
UpgradeStatus: Upgraded to bionic on 2018-05-12 (0 days ago)

** Affects: kexec-tools (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

** Attachment added: "strace-kexec.log"
   https://bugs.launchpad.net/bugs/1770940/+attachment/5138678/+files/strace-kexec.log

** Also affects: systemd (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1770940

Title:
  Kexec reboot doesn't work on 18.04 non-EFI system

Status in kexec-tools package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  Unclear whether to report it against kexec-tools or systemd.

  After upgrading to Ubuntu 18.04, the „systemctl kexec” command gives the following error message:
  Cannot find the ESP partition mount point.

  What's interesting is that strace shows that systemctl tries to find
  the EFI partition before it emits the error message, like it was
  expecting an EFI system. My laptop is not capable of EFI, and it
  wasn't a problem for previous Ubuntu releases – the „systemctl kexec”
  command worked fine before.

  Here is my systemd version:

  root at thinkpad:~# systemd --version
  systemd 237
  +PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid

  And my kexec-tools version is 1:2.0.16-1ubuntu1.

  I attached an strace output.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: kexec-tools 1:2.0.16-1ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sun May 13 12:48:25 2018
  InstallationDate: Installed on 2014-06-10 (1432 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=hu_HU.UTF-8
   SHELL=/bin/bash
  SourcePackage: kexec-tools
  UpgradeStatus: Upgraded to bionic on 2018-05-12 (0 days ago)

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