Here are some of the Settings I made. I think it can help more people
① using you MS or Google account log in bitbucket
② setting an app password with checking all the options
③ Open the Website FEniCS Project repositories - Dolfin ,and then click Clone and choose Http, you can get the clone command.
④ install git-lfs in you Linux Computer, run the clone command. you’ll be asked to enter your bitbucket app password.
⑤ now your computer get Dolfin, run the FEniCS code with XX.xml.gz file in this folder.