In case it's relevant, the other options to force non-interactive install were
in /etc/apt/apt.conf
APT::Get::Show-Upgraded "true";
DPkg::Options {"--force-confmiss";"--force-confold"};
We appear to have worked around it by adding
shim-signed shim/disable_secureboot boolean false
shim-signed shim/enable_secureboot boolean true
in the preseed file.
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https://bugs.launchpad.net/bugs/1603642
Title:
(trusty, debconf passthrough) package shim-signed
1.17~14.04.1+0.8-0ubuntu2 failed to install/upgrade: subprocess
installed post-installation script returned error exit status 128
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