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: bluez (Ubuntu)
Status: Confirmed => Invalid
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See also: bug 1426228
** Summary changed:
- package bluez 5.43-0ubuntu1 failed to install/upgrade: subprocess installed
post-installation script returned error exit status 1
+ package bluez 5.43-0ubuntu1 failed to install/upgrade: subprocess installed
post-installation script returned error