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We extend \cite[Theorem 4.5]{DGNO} and \cite[Theorem 4.22]{LKW} to positivecharacteristic (i.e., to the finite, not necessarily fusion, case). Namely, weprove that if $\D$ is a finite non-degenerate braided tensor category over analgebraically closed field $k$ of characteristic $p>0$, containing a TannakianLagrangian subcategory $\Rep(G)$, where $G$ is a finite $k$-group scheme, then$\D$ is braided tensor equivalent to $\Rep(D^{\omega}(G))$ for some $\omega\inH^3(G,\mathbb{G}_m)$, where $D^{\omega}(G)$ denotes the twisted double of $G$\cite{G2}. We then prove that the group $\mathcal{M}_{{\rm ext}}(\Rep(G))$ ofminimal extensions of $\Rep(G)$ is isomorphic to the group$H^3(G,\mathbb{G}_m)$. In particular, we use \cite{EG2,FP} to show that$\mathcal{M}_{\rm ext}(\Rep(\mu_p))=1$, $\mathcal{M}_{\rm ext}(\Rep(\alpha_p))$is infinite, and if $\O(\Gamma)^*=u(\g)$ for a semisimple restricted $p$-Liealgebra $\g$, then $\mathcal{M}_{\rm ext}(\Rep(\Gamma))=1$ and$\mathcal{M}_{\rm ext}(\Rep(\Gamma\times \alpha_p))\cong \g^{*(1)}$.

Minimal extensions of Tannakian categories in positive characteristic