Package problem in Fedora 28

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You can't upgrade liblinebreak as long as you have zlibrary installed. The liblinebreak packages has been replaced by the by the newer libunibreak packages, and the zlibrary hasn't been rebuilt with that version. You should file a bug report against zlibrary if you depend on it. Otherwise remove that package.

It looks like zlibrary has not received any tender loving care since fedora 23.

Update:

One of these days you will get a new zlibrary packages and your problem will be solved.

[root@mybox ~]# dnf --enablerepo=updates-testing list  zlibrary.x86_64
Last metadata expiration check: 0:02:02 ago on Thu 06 Sep 2018 14:10:32 CEST.
Available Packages
zlibrary.x86_64              0.99.4-2.fc28       updates-testing
[root@mybox ~]#