  The semileptonic $B$ meson decays of the type $B \to X_u \ell \nu$ are
important for measuring the magnitude of the CKM matrix element $V_{ub}$.
Recent measurements of inclusive $B \to X_u e \nu_e$ and hadronically tagged
$B^0 \to \pi^- \ell^+ \nu$ from the Belle II experiment are presented. The
results are obtained using the data collected at Belle II between March 2019
and March 2020, with a total integrated luminosity of 37.8 ${\rm fb}^{-1}$.
These preliminary measurements are used to validate the detector and
reconstruction software performance. The measured preliminary branching
fraction of $B^0 \to \pi^- \ell^+ \nu$ decays is $(1.58 \pm
0.43_{\textrm{stat}} \pm 0.07_{\textrm{sys}})\cdot 10^{-4}$, which is in
agreement with the world average, $(1.50 \pm 0.06)\cdot 10^{-4}$.
