nano-tiny binary package in Ubuntu Bionic s390x

 GNU nano is an easy-to-use text editor originally designed as a replacement
 for Pico, the ncurses-based editor from the non-free mailer package Pine
 (itself now available under the Apache License as Alpine).
 .
 This package contains a build of GNU nano with many features disabled, for
 environments such as rescue disks where resources are limited.

Source package