That version is now dead
http://news.softpedia.com/news/ubuntu-17-04-zesty-zapus-has-reached-end-of-life-upgrade-to-ubuntu-17-10-now-519360.shtml
** Changed in: grub2-signed (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1682839
Title:
package grub-efi-amd64-signed 1.80+2.02~beta3-4ubuntu2 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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