login problems on android 2.1

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http://askubuntu.com – I have downloaded the ubuntu one app for android into an android 2.1 tablet (bq verne). My account works perfectly well on ubuntu 12.04 and Windows 7 even on android 2.2(galaxy S), but on android 2.1 I write the password, it logs but when it is already syncronizing the folders it goes back to login screen. Any help? (HowTos)