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This bug was fixed in the package live-build - 3.0~a57-1ubuntu25.5

---------------
live-build (3.0~a57-1ubuntu25.5) xenial; urgency=medium

  [ Balint Reczey ]
  * Don't fail when initramfs is not used (LP: #1720217)

 -- Steve Langasek <steve.langasek@xxxxxxxxxx>  Mon, 02 Oct 2017
16:57:51 -0700

** Changed in: live-build (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1720217

Title:
  Allow building images with kernels without initrd

Status in live-build package in Ubuntu:
  Fix Released
Status in live-build source package in Xenial:
  Fix Released
Status in live-build package in Debian:
  New

Bug description:
  [SRU Justification]
  initramfsless boot is an important enhancement to decrease boot times and increase density for cloud images.  Unfortunately, live-build assumes that an initramfs is used, and image builds fail if it is not present.  Fix this so that these improvements can be applied to the LTS, which represents the vast majority of cloud instances.

  [Test case]
  1. Build livecd-rootfs from lp:~ubuntu-core-dev/livecd-rootfs/xenial-proposed
  2. Install this version of livecd-rootfs with the xenial-updates live-build.
  3. Create a build directory with 'mkdir build-dir; cd build-dir'
  4. Attempt an image build with the command (as root): 'cp -a /usr/share/livecd-rootfs/live-build/{auto,ubuntu-cpc}/ .; env PROJECT=ubuntu-cpc SUBPROJECT=minimized ARCH=amd64 SUITE=xenial lb config && env PROJECT=ubuntu-cpc SUBPROJECT=minimized ARCH=amd64 lb build'
  4. Confirm that this fails to produce output, with the error 'cp: cannot stat 'chroot/boot/initrd.img-*': No such file or directory'
  5. Clean up the build tree with 'rm -r --one-file-system .build/ *'
  6. Install live-build from xenial-proposed.
  7. Attempt a second image build with the same command from step 4.
  8. Confirm that this produces output files in the current directory.

  [Regression potential]
  If another bug is introduced elsewhere that causes an initramfs to fail to be generated in the expected location as part of an image that does require one, the resulting image build will fail or will fail to boot due to the ignored error.

  [Original description]
  Lb may fail when creating an image with a kernel not requiring, hence initramfs-tools not building initrd.
  ...
  P: Begin installing local package lists...
  [2017-09-28 15:55:06] lb_binary_linux-image
  P: Begin install linux-image...
  cp: cannot stat 'chroot/boot/initrd.img-*': No such file or directory
  P: Begin unmounting filesystems...
  P: Saving caches...
  Reading package lists...
  Building dependency tree...
  ...

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