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: shim-signed (Ubuntu)
Status: New => Invalid
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Bugs,
** Summary changed:
- package shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to
install/upgrade: subprocess installed post-installation script returned error
exit status 1
+ (non-UEFI, Ubuntu 17.04) package shim-signed
1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade:
