(In my case this message never appeared before installing Ubuntu One - see this question). Can I use Ubuntu One and avoid being prompted each time like this? I use Lubuntu 12.04.

Edit: After exchanging comments I add the supplementary info:

1. I am asked for password and to select session if I log out and in (auto-login is NOT set).
2. Ubuntu One is installed but set NOT to start with session.
3. Keyring appears nonetheless.
4. Before installing Ubuntu One this didn't happen.

Also, following the advice of con-f-use, I have entered ps -A | grep -i ubunt[u] in terminal, and got 2346 ? 00:00:01 ubuntuone-syncd, which means that ubuntuone is running when it was not supposed to.