The error in your logs is:
quit
Use of uninitialized value $reply in scalar chomp at
/usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 66, <GEN0> line 11.
Use of uninitialized value $reply in concatenation (.) or string at
/usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 67, <GEN0> line 11.
Use of uninitialized value $reply in split at
/usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 68, <GEN0> line 11.
Use of uninitialized value $ret in string eq at
/usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 212, <GEN0> line 11.
Use of uninitialized value $_[1] in join or string at
/usr/share/perl5/Debconf/DbDriver/Stack.pm line 111, <GEN0> line 11.
Use of uninitialized value $reply in scalar chomp at
/usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 66, <GEN0> line 11.
Use of uninitialized value $reply in concatenation (.) or string at
/usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 67, <GEN0> line 11.
Use of uninitialized value $reply in split at
/usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 68, <GEN0> line 11.
Use of uninitialized value $val in substitution (s///) at
/usr/share/perl5/Debconf/Format/822.pm line 83, <GEN2> line 8.
Use of uninitialized value $val in concatenation (.) or string at
/usr/share/perl5/Debconf/Format/822.pm line 84, <GEN2> line 8.
This looks like the install "hung" from your perspective, but the
debconf interface was waiting from input somewhere; and it never got it,
possibly because of a ^C in the terminal.
What package manager frontend were you using for this upgrade? The
apport-attached information doesn't show this, but only shows that
aptdaemon was used as the backend.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1605376
Title:
package shim-signed 1.17~15.10.1+0.8-0ubuntu2 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 128
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