I think update-manager? One of the standard GUI updater things.

Here's a chunk of ps -AF --forest that might help:
alex      6365     1  0 84088 18916   2 Jul30 ?        00:00:00 /usr/bin/python 
/usr/lib/update-notifier/backend_helper.py show_updates
alex      6370  6365  0 173663 123028 2 Jul30 ?        00:00:11  \_ 
/usr/bin/python3 /usr/bin/update-manager --no-update
alex      7919  6370  0 17241 14224   2 Jul30 ?        00:00:00      \_ 
/usr/bin/perl -w /usr/bin/debconf-communicate
root      7180     1  0 76314 66688   2 Jul30 ?        00:00:04 
/usr/bin/python3 /usr/sbin/aptd
root      7189  7180  0 76315 47888   3 Jul30 pts/3    01:13:37  \_ 
/usr/bin/python3 /usr/sbin/aptd
root      7916  7189  0  5261 10480   2 Jul30 pts/6    00:00:00      \_ 
/usr/bin/dpkg --status-fd 99 --configure shim-signed:amd64 dkms:all 
x11proto-randr-dev:all
root      7917  7916  0 17788 14340   0 Jul30 pts/6    00:00:00          \_ 
/usr/bin/perl -w /usr/share/debconf/frontend 
/var/lib/dpkg/info/shim-signed.postinst configure 1.17~14.04.1+0.8-0ubuntu2
--
[...]
alex     23733     1  0 84089 20524   3 20:54 ?        00:00:00 /usr/bin/python 
/usr/lib/update-notifier/backend_helper.py show_updates
alex     23738 23733  2 166574 182760 0 20:54 ?        00:00:02  \_ 
/usr/bin/python3 /usr/bin/update-manager --no-update

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https://bugs.launchpad.net/bugs/1607929

Title:
  (trusty, debconf passthrough) 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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