What is top priority for Nigeria's new head of state?

Muhammadu Buhari is being sworn in as Nigeria's 15th head of state on Friday.

He defeated incumbent President Goodluck Jonathan in the general elections in March.

Expectations are high that Mr Buhari will bring much needed change to Nigeria.

The country has suffered with the Boko Haram insurgency, corruption, fuel shortages, high unemployment and slower economic growth.

The BBC's Abdullahi Kaura Abubakar reports.