trn4 binary package in Ubuntu Bionic amd64

 trn is a threaded news reader with a long history, descended from Larry
 Wall's rn (part of the second generation of newsreaders). It has a
 powerful full screen text mode user interface, where most actions are
 available at the press of a single key. It is highly configurable.
 .
 This version of trn reads news from a news server via NNTP (the Network
 News Transfer Protocol). You must have a news server available - large
 sites usually provide a site-wide server.
 .
 If you install a news server on your system (either containing just
 local newsgroups or with a partial or full USENET feed) you can
 configure trn to access it. In this case you will also need to install
 an appropriate 'inews' package for local posting.
 .
 This is a separate package from trn because trn 4.0 has enough
 substantial changes in its default behaviour (for instance, the group
 selector is new in 4.0) that some users prefer to stay with an older
 version of trn.

Source package