Good man. Installing ubuntu-sso-client-qt solved the issue for me.
thanks
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https://bugs.launchpad.net/bugs/1311027
Title:
Reinstall Previous Purchases button on File tab does nothing
Same problem for me after migrating t 14.04. Output is as below.
2014-06-13 19:05:59,546 - softwarecenter.backend.login_impl.login_sso - ERROR -
_on_credentials_error for Ubuntu One: dbus.Dictionary({dbus.String(u'errtype'):
dbus.String(u'GUINotAvailableError'), dbus.String(u'message'):
