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Exact solutions of the Ginzburg-Landau (GL) equation for the straight filmsubjected at its edges to the Robin-type boundary conditions characterized bythe extrapolation length $\Lambda$ are analyzed with the primary emphasis onthe interaction between the coefficient $\beta$ of the cubic GL term and the deGennes distance $\Lambda$ and its influence on the temperature $T$ of thestrip. Very substantial role is played also by the carrier density $n_s$ thatnaturally emerges as an integration constant of the GL equation. Physicalinterpretation of the obtained results is based on the $n_s$-dependenteffective potential $V_{eff}({\bf r})$ created by the nonlinear term and itsinfluence on the lowest eigenvalue of the corresponding Schr\"{o}dingerequation. In particular, for the large cubicities, the temperature $T$ becomes$\Lambda$ independent linearly decreasing function of the growing $\beta$ sincein this limit the boundary conditions can not alter very strong $V_{eff}$. Itis shown that the temperature increase, which is produced in the linear GLregime by the negative de Gennes distance, is wiped out by the growingcubicity. In this case, the decreasing $T$ passes through its bulk value $T_c$at the unique density $n_s^{(0)}$ only, and the corresponding extrapolationlength $\Lambda_{T=T_c}$ is an analytical function of $\beta$ whose propertiesare discussed in detail. For the densities smaller than $n_s^{(0)}$, thetemperature stays above $T_c$ saturating for the large cubicities to the valuedetermined by $n_s$ and negative $\Lambda$ while for $n_s>n_s^{(0)}$ thesuperconductivity is destroyed by the growing GL nonlinearity at sometemperature $T>T_c$, which depends on $\Lambda$, $n_s$ and $\beta$. It isproved that the concentration $n_s^{(0)}$ transforms for the large cubicitiesinto the density of the bulk sample.

Influence of the interplay between de Gennes boundary conditions and cubicity of Ginzburg-Landau equation on the properties of superconducting films