Check this if dropbox broken on ubuntu
http://www.muktware.com/3742/dropbox-broken-linux
32-bit:
cd ~ && wget -O - "https://www.dropbox.com/download?plat=lnx.x86" | tar xzf -
64-bit:
cd ~ && wget -O - "https://www.dropbox.com/download?plat=lnx.x86_64" | tar xzf -
Now run the Dropbox daemon from the newly created .dropbox-dist folder.
~/.dropbox-dist/dropboxd
