MDEV-286, the mytop program was added to mariadb-client-5.5 .deb.
But this is a problem - because there is already a standalone debian/ubuntu mytop package. So now install/upgrade of mariadb-client-5.5 conflicts if mytop is already installed.
I do not think there is a pressing need to deliver an alternative to mytop on .deb platforms, so I suggest just removing mytop again from .deb.
However, if we really want to provide an alternative .deb for mytop, then we
- need to put it in a separate package, with proper /usr/share/doc/mytop/* and so on
- need to create correct dependencies so upgrades will go smooth
- need to check existing mytop package - there are a number of patches included, and we need to review them and include relevant ones so users do not loose important functionality in the upgrade