I've noticed this issue with blank '/boot/retpoline-*' files in 16.04
LTS Release (i386/x86_32) after Linux kernel update to the v4.4.0-115
version. (Generally, I've started to seeing these files when
"Spectre_V12" patches were available for i386 architecture. I wanted to
ask a question or report a bug about it etc.) So, these files are empty
and it looks this way on 16.04 LTS Release:

[~]$ ls -al /boot/retpoline-4.4.0-11*
-rw-r--r-- 1 root root 0 lut 11 19:00 /boot/retpoline-4.4.0-115-generic
-rw-r--r-- 1 root root 0 lut 13 00:14 /boot/retpoline-4.4.0-116-generic

[~]$ uname -m

Thanks, best regards.

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  retpoline abi files are empty on i386

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Artful:
  Fix Committed

Bug description:
  The <flavour>.retpoline files in the current abi are actually blank.
  This is due to incorrect handling in retpoline-extract.

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