The taking of the oath of office by an individual specified in section 84-120, except the Lieutenant Governor, shall be held to constitute his resignation from the office by virtue of the holding of which he qualifies to act as Governor.
Neb. Rev. Stat. § 84-122 — under STATE OFFICERS.
Neb. Rev. Stat. § 84-122
The taking of the oath of office by an individual specified in section 84-120, except the Lieutenant Governor, shall be held to constitute his resignation from the office by virtue of the holding of which he qualifies to act as Governor.