The output in your dpkg upgrade log shows:
Processing triggers for shim-signed (1.17~14.04.1+0.8-0ubuntu2) ...
Use of uninitialized value $ret in string eq at
/usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 212, <GEN0> line 22.
Use of uninitialized value $_[1] in join or string at
/usr/share/perl5/Debconf/DbDriver/Stack.pm line 111, <GEN0> line 22.
Use of uninitialized value $_[1] in join or string at
/usr/share/perl5/Debconf/DbDriver/Stack.pm line 111, <GEN0> line 22.
Use of uninitialized value $ret in string eq at
/usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 212, <GEN0> line 29.
Use of uninitialized value $_[1] in join or string at
/usr/share/perl5/Debconf/DbDriver/Stack.pm line 111, <GEN0> line 29.
[...]
This indicates a problem with the debconf prompting code. What program
were you running to do the upgrade?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1607929
Title:
package shim-signed 1.17~14.04.1+0.8-0ubuntu2 failed to
install/upgrade: subprocess installed post-installation script was
killed by signal (Terminated)
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