  In-medium ${\bar K}N$ scattering amplitudes developed within a new chirally
motivated coupled-channel model due to Cieply and Smejkal that fits the recent
SIDDHARTA kaonic hydrogen 1s level shift and width are used to construct $K^-$
nuclear potentials for calculations of $K^-$ nuclear quasi-bound states. The
strong energy and density dependence of scattering amplitudes at and near
threshold leads to $K^-$ potential depths $-Re V_K \approx 80 -120$ MeV.
Self-consistent calculations of all $K^-$ nuclear quasi-bound states, including
excited states, are reported. Model dependence, polarization effects, the role
of p-wave interactions, and two-nucleon $K^-NN\rightarrow YN$ absorption modes
are discussed. The $K^-$ absorption widths $\Gamma_K$ are comparable or even
larger than the corresponding binding energies $B_K$ for all $K^-$ nuclear
quasi-bound states, exceeding considerably the level spacing. This discourages
search for $K^-$ nuclear quasi-bound states in any but lightest nuclear
systems.
