After World War II he engaged in rebuilding structures of self-rule in the Soviet occupation zone and was a co-founder and member of the Liberal Democratic Party of Germany (LDPD).

Hübener then dedicated his time and effort to scientific and artistic questions, publishing smaller works in these fields under the pseudonym J.S.

Then the SVAG appointed Hübener as the president of the Province of Saxony, a newly created function based in Halle upon Saale.

On 3 December 1946, the members of the provincial parliament elected Hübener the first minister-president of Saxony-Anhalt with the votes of CDU and LDPD.

This made him the only governor in the Soviet zone, who was not a member of the Communist Socialist Unity Party of Germany (SED).

Hoping to avoid the eventual establishment of separate German republics – which was underways with the Bizone – he was, however, disappointed by his Western colleagues (among them his long-time fellow party member Reinhold Maier, then minister-president of Württemberg-Baden).

Most of them were already assured that the constitution of a democratic and autonomous German republic can impossibly include the Soviet zone with their puppet states, whereas the zonal central administrations (Zentralverwaltungen) established in July 1945, staffed with communists and directed by the SVAG, were taking the decisions.

While Easterners hoped with a quadripartite Allied agreement there would be the chance that the Soviet Union will release its prey, many Westerners had already come to another conclusion.

The Free Democratic Party, section Sachsen-Anhalt, established in his honour the Erhard-Hübener-Stiftung, a foundation in Halle upon Saale.