The error in your logs is:
debconf: DbDriver "passwords" warning: /var/cache/debconf/passwords.dat is
locked by another process: Resource temporarily unavailable
debconf: DbDriver "templatedb": /var/cache/debconf/templates.dat is locked by
another process: Resource temporarily unavailable
dpkg: error processing package shim-signed (--configure):
subprocess installed post-installation script returned error exit status 1
Do you know why your debconf database is locked by some other process
while apt is running?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1694313
Title:
package shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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