In this paper we develop and
generalize some previously announced results concerning ubiquitous convex sets. We
show two conditions which are sufficient to assert that a convex set which is
ubiquitous-elementary or ubiquitous-basic is also linearly bounded. In showing the
essential part played by the ubiquitous convex sets of countable infinite dimension we
establish that in an infinite-dimensional real vector space every ubiquitous
convex set contains a linearly bounded ubiquitous convex set of a specific
type.