Comment 28 for bug 711162

A follow up to the previous message.

In case you do have a custom Python installation then this is what breaks ubuntu-sso-client since the packaged version uses /usr/bin/env python which in turn causes your custom interpreter to be started which may not know about ubuntuone modules at all. The task to switch to /usr/bin/python interpreter for various Ubuntu One-related applications is LP:984089.

The comment in #25 is an example of custom python installations that gets used by default.