I'm not the original reporter, but I hit (and analyzed) what seems to be
the same failure in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1820755

I just switched our packer template over to -proposed to test this:

i.e. changed it to use http://archive.ubuntu.com/ubuntu/dists/xenial-
proposed/main/installer-
amd64/20101020ubuntu451.28/images/netboot/mini.iso, added apt-
setup/proposed=true to the kernel command-line) and I can confirm that
this runs to completion (whereas xenial-
updates/current/images/netboot/mini.iso errors out.

debootstrap still initially installs the original xenial version of
linux-base (but that's expected, since debootstrap is unable to look at
multiple repositories), but it eventually gets upgraded

debootstrap: Preparing to unpack .../linux-base_4.0ubuntu1_all.deb ...
debootstrap: Unpacking linux-base (4.0ubuntu1) ...
...
debootstrap: Setting up linux-base (4.0ubuntu1) ...

... but later on (once base-installer is doing the kernel using the real
in-target apt-get) it picks up the new kernel from xednial-proposed, and
that prods it to pick up the new linux-base from xenial-updates ...

in-target: The following additional packages will be installed:
in-target:   linux-base linux-headers-4.4.0-145 linux-headers-4.4.0-145-generic
in-target:   linux-headers-generic linux-headers-virtual 
linux-image-4.4.0-145-generic
in-target:   linux-image-virtual linux-modules-4.4.0-145-generic
in-target: Suggested packages:
in-target:   fdutils linux-doc-4.4.0 | linux-source-4.4.0 linux-tools
in-target: Recommended packages:
in-target:   grub-pc | grub-efi-amd64 | grub-efi-ia32 | grub | lilo
in-target: The following NEW packages will be installed:
in-target:   linux-headers-4.4.0-145 linux-headers-4.4.0-145-generic
in-target:   linux-headers-generic linux-headers-virtual 
linux-image-4.4.0-145-generic
in-target:   linux-image-virtual linux-modules-4.4.0-145-generic linux-virtual
in-target: The following packages will be upgraded:
in-target:   linux-base
in-target: 1 upgraded, 8 newly installed, 0 to remove and 98 not upgraded.
in-target: Need to get 29.8 MB of archives.
in-target: After this operation, 146 MB of additional disk space will be used.
in-target: Get:1 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 
linux-base all 4.5ubuntu1~16.04.1 [18.1 kB]
in-target: Get:2 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 
linux-headers-4.4.0-145 all 4.4.0-145.171 [10.0 MB]
in-target: Get:3 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 
linux-headers-4.4.0-145-generic amd64 4.4.0-145.171 [820 kB]
in-target: Get:4 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 
linux-headers-generic amd64 4.4.0.145.153 [2,568 B]
in-target: Get:5 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 
linux-headers-virtual amd64 4.4.0.145.153 [1,760 B]
in-target: Get:6 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 
linux-modules-4.4.0-145-generic amd64 4.4.0-145.171 [12.0 MB]
in-target: Get:7 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 
linux-image-4.4.0-145-generic amd64 4.4.0-145.171 [6,919 kB]
in-target: Get:8 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 
linux-image-virtual amd64 4.4.0.145.153 [2,694 B]
in-target: Get:9 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 
linux-virtual amd64 4.4.0.145.153 [1,778 B]

... and it unpacks that first ...

in-target: Preparing to unpack .../linux-base_4.5ubuntu1~16.04.1_all.deb ...
in-target:
in-target: Unpacking linux-base (4.5ubuntu1~16.04.1) over (4.0ubuntu1) ...
...
in-target: Setting up linux-base (4.5ubuntu1~16.04.1) ...

...and the symlinks in postinst work ...

in-target: Setting up linux-image-4.4.0-145-generic (4.4.0-145.171) ...^M
in-target: I: /vmlinuz.old is now a symlink to boot/vmlinuz-4.4.0-145-generic^M
in-target: I: /initrd.img.old is now a symlink to 
boot/initrd.img-4.4.0-145-generic^M
in-target: I: /vmlinuz is now a symlink to boot/vmlinuz-4.4.0-145-generic^M
in-target: I: /initrd.img is now a symlink to 
boot/initrd.img-4.4.0-145-generic^M
in-target: Setting up linux-image-virtual (4.4.0.145.153) ...^M
in-target: Setting up linux-virtual (4.4.0.145.153) ...^M

So... I don't know if you need verification from the original reporter
too, but it looks good to me.

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https://bugs.launchpad.net/bugs/1820419

Title:
  linux-generic should depend on linux-base >=4.1

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