Login error with Remote Desktop to Ubuntu server

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http://serverfault.com – I use Ubuntu Cloud Guest account and install xrdp (sudo apt-get install xrdp) then I use Remote Desktop Connection of Windows to remote it. But on login step I always get this error after I enter username and password even though I did enter them very carefully. connecting to sesman ip port 3350 sesman connect ok sending login info to sesman xrdp_mm_process_login_response: login failed Am I missing something ? (HowTos)