Comment 2 for bug 540568

Nick,
Thank you for filing a bug report about your issue. The information collected from these reports helps to make Ubuntu better. It looks like your issue is caused by having a newer version of metadata on your machine. Did you install the trunk version of Ubuntu One then go back to the stable version in the repository?

To fix this you need to repopulate your metadata with the version currently in use by your version of Ubuntu One. If you have anything of great importance in your Ubuntu One folder you you might want to back it up before proceeding (never can be too safe)

1. Quit the Ubuntu One client. From the applet select Quit. Then open a Terminal (Applications > Accessories > Terminal) and run the following to quit the syncdaemon.

u1sdtool -q

2. Delete the old metadata. In a Terminal run.

rm -rf ~/.local/share/ubuntuone

3. Start Ubuntu One as you normally would Applications > Internet > Ubuntu One

It'll run for a bit as it recreates the metadata. After awhile copy in a small file to see if it syncs. If this is unsuccessful please come back here and change the 'Status' of this bug back to 'New' and attach the following logs to this bug: ~/.cache/ubuntuone/log/syncdaemon.log & ~/.cache/ubuntuone/log/syncdaemon-exceptions.log

thank you,
duanedesign