  Euclidean $SU(2)$ gauge theory is studied in a nonlinear gauge. In this
theory, ghost condensation happens and gauge fields acquire tachyonic masses.
It is shown that these tachyonic masses are removed by a gauge field condensate
$\langle A_{\mu}^+A_{\mu}^-\rangle$. Because of the ghost condensation,
monopole solutions are included naturally. We find the condensate $\langle
A_{\mu}^+A_{\mu}^-\rangle$ makes the magnetic potential massive.
