Users cannot update avatar

Problem

Some users are unable to upload to new user profile picture on Confluence server. They get the error message

An error occurred while updating avatar details.

Solution

The problem can be due to file system permissions. You might need to grant all permissions to the user running Confluence to access the confluence-home and confluence-install directories. In this case specifically the data/attachments/ directory.

See Atlassian Knowledge Base article for details.