Thanks a lot, man! This issue started appearing on two of my machines after upgrading to Ubuntu 12.10. I also left a breadcrumb in a Dropbox forum thread where I noticed people described the same problem https://forums.dropbox.com/topic.php?id=44314
Thanks! I wasn't sure what consequences the error would have, but this seems to have fixed it.
I just upgraded to Xubuntu 12.10 and had the same problem. Other than my version of libstdc++ now being 6.0.17, these instructions worked. Thanks for posting.
I'm glad it helps you guys.