Demise
There are various narrations with regard to Hazrat Ubayy’s (ra) demise.
According to one narration Hazrat Ubayy (ra) passed away in 22 AH during the Khilafat of Hazrat Umar (ra), whereas according to another narration, he passed away in 30 AH during the Khilafat of Hazrat Uthman (ra) – this [latter] narration seems more accurate because Hazrat Uthman (ra) appointed Hazrat Ubayy (ra) for the standardisation of the readings of the Quran.
(Ibn Saad, Al-Tabaqat al-Kubra, Vol. 3 [Beirut, Lebanon: Dar al-Kutub al-Ilmiyyah, 2017] 381) (Ibn Hajar al-Asqalani, Al-Isabah fi Tamyiz al-Sahabah, Vol. 1 [Beirut, Lebanon: Dar al-Fikr, 2001] 35-36)