Show errror on Install easy way in Ubuntu 16.4

I’m trying to install in Ubuntu 16.4
but show this error

TASK [Set root Password] *******************************************************
fatal: [localhost]: FAILED! => {"changed": true, "cmd": ["mysqladmin", "-u", "root", "password", "root"], "delta": "0:00:00.065271", "end": "2016-08-20 10:28:38.514661", "failed": true, "rc": 1, "start": "2016-08-20 10:28:38.449390", "stderr": "\u0007mysqladmin: connect to server at 'localhost' failed\nerror: 'Access denied for user 'root'@'localhost' (using password: NO)'", "stdout": "", "stdout_lines": [], "warnings": []}
    to retry, use: --limit @develop/install.retry

PLAY RECAP *********************************************************************
localhost                  : ok=18   changed=4    unreachable=0    failed=1   

Traceback (most recent call last):
  File "", line 342, in <module>
  File "", line 108, in install_bench
    run_playbook('develop/install.yml', sudo=True, extra_vars=extra_vars)
  File "", line 292, in run_playbook
    success = subprocess.check_call(args, cwd=os.path.join(cwd, 'playbooks'))
  File "/usr/lib/python2.7/", line 541, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['ansible-playbook', '-c', 'local', 'develop/install.yml', '-e', '@/tmp/extra_vars.json', '--become', '--become-user=mainul']' returned non-zero exit status 2

Maybe can’t set Mariadb Password.
Please help me.

@shreyasp @vjFaLk is there a permanent way to fix this?

This is a solution we can try.

@mainul I’m assuming you set the password before / ran the installer twice.

Have same problem today 30/11/2016