Linux users are reporting problems with Dropbox installation on their machines.

Dropbox user Marco F. reported on Dropbox forum:

I am not able to install dropbox on Ubuntu 12.04, x64, freshly installed and fully updated.

I could not install dropbox either from the Ubuntu Software Center (stuck at "Applying Changes") or the command line (sudo apt-get install nautilus-dropbox, stuck at 99% downloading).

We were able to reproduce the problem on various GNU/Linux distributions including Ubuntu, Kubuntu, Fedora and openSUSE. Everything works fine with the installation of nautilus-dropbox but when it tries to install the proprietary dropbox daemon it gets stuck at 99%.

If you are also facing the same issue with Dropbox report it on the forum. We are expecting Dropbox to fix this bug soon and also explain what caused this problem.

Workaround: How To Make Dropbox work under Linux
You can easily install Dropbox using command line and escape the above mentioned problem. Run the following command in your Linux terminal. Just remember you will be able to run Dropbox using CLI only.

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

You will now be greeted by the Dropbox dialogue box.

Update: Dropbox Team Responds
David from the Dropbox team has responded to the issue on the forum:

Hey guys,
On Ubuntu and Debian we've changed our package name and versioning to not conflict with their packaging of nautilus-dropbox (which by the way is unsupported by us).  Basically if what you have installed is called nautilus-dropbox then it is the incorrect package.  Please uninstall it and go to www.dropbox.com/install and download the latest package (dropbox-1.4.0 at the time I wrote this) and install that.
Thanks,
David

Thanks jon_downfromthetrees for the workaround tip.