I think your suggestion is correct. I used dpkg-reconfigure to re-run
shim-signed and a window popped up asking me to disable secure boot.
This didn't appear in the original run.
I'm using Ubuntu Gnome 15.10 (updated to 16.04 today), and used the
Software Updater app to apply updates. This was
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, line 11.
Use of uninitialized value $reply in concatenation (.) or string at
/usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 67, line 11.
Use
** Tags removed: need-duplicate-check
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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
