[Merge] ~davidkrauser/livecd-rootfs/+git/livecd-rootfs:buildd-bootable/bionic into livecd-rootfs:ubuntu/bionic

[David Krauser]

David Krauser has proposed merging ~davidkrauser/livecd-rootfs/+git/livecd-rootfs:buildd-bootable/bionic into livecd-rootfs:ubuntu/bionic.

Commit message:
Backports to enable building of bootable buildd images

Requested reviews:
  Robert C Jennings (rcj)
Related bugs:
  Bug #1863024 in livecd-rootfs (Ubuntu): "SRU: bootable buildd images for all releases"
  https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/1863024

For more details, see:
https://code.launchpad.net/~davidkrauser/livecd-rootfs/+git/livecd-rootfs/+merge/380908
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