  The leading superconducting instabilities of the two-dimensional extended
repulsive one-band Hubbard model within spin-fluctuation pairing theory depend
sensitively on electron density, band and interaction parameters. We map out
the phase diagrams within a random phase approximation (RPA) spin- and
charge-fluctuation approach, and find that while $B_{1g}$ ($d_{x^2-y^2}$) and
$B_{2g}$ ($d_{xy}$) pairing dominates in the absence of repulsive longer-range
Coulomb interactions $V_{\rm NN}$, the latter induces pairing in other symmetry
channels, including e.g $A_{2g}$ ($g$-wave), nodal $A_{1g}$ (extended
$s$-wave), or nodal $E_u$ ($p$-wave) spin-triplet superconductivity. At the
lowest temperatures, transition boundaries in the phase diagrams between
symmetry-distinct spin-singlet orders generate complex time-reversal symmetry
broken superpositions. By contrast, we find that boundaries between singlet and
triplet regions are characterized by first-order transitions. Finally,
motivated by recent photoemission experiments, we have determined the influence
of an additional explicitly attractive nearest-neighbor interaction, $V_{\rm
NN}<0$, on the superconducting gap structure. Depending on the electronic
filling, such an attraction boosts $E_u$ ($p$-wave) spin-triplet or $B_{1g}$
($d_{x^2-y^2}$) spin-singlet ordering.
