In Jira I'm unable to edit the priority of a Bug but I'm able to do so for other type of tickets.

[Muzzamil]

How to edit or update the priority of a ticket type bug. 

I'm able to edit the priority of other ticket types like story, sub-tasks etc., but not for ticket type Bug.

[Matt Parks]

The likely explanation is that, for the Screen Scheme that the Bug is using, the Priority field is not on the Edit screen. I believe the Priority field, being a system field, is always displayed on the View screen, but you can't edit it unless it's on the Edit screen.

[Le Hong Long]

I have the same issue with an error message below

[Trudy Claspill]

Hello @Muzzamil 

Welcome to the Atlassian community!

What happens when you try to edit the priority on Bugs? Is the field disabled? Do you get an error message? Can you provide a screen image of what you see?