Sheesh - we hit a similar issue on staging and fixed the citext issue there, and specifically asked how we can make sure the same fix is applied on prod when the prod db was upgraded, as it wasn't at that point.
Not sure if it's identical, but here's the RT with the details https://rt.admin.canonical.com/Ticket/Display.html?id=69883
Sheesh - we hit a similar issue on staging and fixed the citext issue there, and specifically asked how we can make sure the same fix is applied on prod when the prod db was upgraded, as it wasn't at that point.
Not sure if it's identical, but here's the RT with the details https:/ /rt.admin. canonical. com/Ticket/ Display. html?id= 69883