dropbox problem in ubuntu 14.04

After updating Ubuntu, at some point
the dropbox does not work/start properly.

Dropbox daemon, 'dropboxd', is located at '.dropbox-dist/'.
It seems like there is some version problem in daemon.
So, I am trying to solve this by

sudo rm -rf /var/lib/dropbox/.dropbox-dist
dropbox start -i

However, it does not solve the problem.

So, I look the Dropbox homepage and followed the instruction,

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 -

Next, run the Dropbox daemon from the newly created .dropbox-dist folder.

~/.dropbox-dist/dropboxd &

At least, this works. But because it is a directly installed, automatic update

will not work.