xtrabackup 2.3.7-0ubuntu2 (ppc64el binary) in ubuntu bionic

 In 2.2.x, the XtraBackup package name was rebranded to
 percona-xtrabackup. This package is an empty dummy package
 that depends on percona-xtrabackup, and replaces older versions of
 xtrabackup (2.0.0). It is not intended to be installed manually.