32bit:
mkdir /tmp/ubuntuone
wget https://launchpad.net/ubuntu/+source/ubuntuone-client-gnome/4.2.0-0ubuntu1/+build/4405130/+files/ubuntuone-client-gnome_4.2.0-0ubuntu1_i386.deb -O /tmp/ubuntuone/ubuntuone-client-gnome_4.2.0-0ubuntu1_i386.deb
wget https://launchpad.net/ubuntu/+source/ubuntuone-client/4.2.0-0ubuntu1/+build/4405193/+files/libsyncdaemon-1.0-1_4.2.0-0ubuntu1_i386.deb -O /tmp/ubuntuone/libsyncdaemon-1.0-1_4.2.0-0ubuntu1_i386.deb
sudo dpkg -i /tmp/ubuntuone/*.deb
64bit:
mkdir /tmp/ubuntuone
wget https://launchpad.net/ubuntu/+source/ubuntuone-client-gnome/4.2.0-0ubuntu1/+build/4405128/+files/ubuntuone-client-gnome_4.2.0-0ubuntu1_amd64.deb -O /tmp/ubuntuone/ubuntuone-client-gnome_4.2.0-0ubuntu1_amd64.deb
wget https://launchpad.net/ubuntu/+source/ubuntuone-client/4.2.0-0ubuntu1/+build/4405191/+files/libsyncdaemon-1.0-1_4.2.0-0ubuntu1_amd64.deb -O /tmp/ubuntuone/libsyncdaemon-1.0-1_4.2.0-0ubuntu1_amd64.deb
sudo dpkg -i /tmp/ubuntuone/*.deb
Then, restart Nautilus:
nautilus -q