Comment 3 for bug 347916

Errata text added for beta:

 * On desktop installations from USB disks, such as typical Ubuntu Netbook Remix installations, the installer displays a warning about the fact that the installation medium itself (often `/dev/sdb`) is mounted. This warning is unnecessary, because the fact that it is mounted is completely normal, and does not interfere with the user's ability to install the system to devices other than the USB disk itself. You should ignore this warning; note that in order to do so you will need to select "Go Back", due to the issue above. Bug:347916

I'll leave this bug just Fix Committed on ubuntu-release-notes for now just in case, but we really ought to get this fixed properly for final in which case the release notes task can be closed.