I have had a look at the newest version of the Ubuntu Unity interface and it is not the theme-able interface that the Gnome 2 and Xfce desktops are. When I had Gentoo installed with the Gnome 2 desktop, the GDM theme selector was enabled, allowing you to select any theme you wanted for the login manager and use themes downloaded off the Internet. But this is not allowed any more, which is a huge shame. The LightDM login manager that is replacing the GDM login manager in the Ubuntu distribution may not be as customisable as the old GDM login manager. Nowadays they just want a locked down touch screen interface and not allow so much theming and configuration as you got with old Window Managers. Hopefully the famous security of the Linux operating system will be maintained in the newest Ubuntu releases.
That is very important, users must be confident that their data is secure whilst using Ubuntu and the Ubuntu One cloud service. When using a cloud storage service for backup, you must keep a local copy of the data as well as an online backup, as something could happen to your data and if you do not keep a local backup, then you are in trouble. There is an article in the December 2011 issue of PC Authority that covers this issue in depth, but the tl;dr version is simply to keep backups of important data locally as well as a copy in the cloud, that way you can sleep well at night with the knowledge that your precious files are safe. But getting back to the issue at hand, the lack of customisation of the Ubuntu interface is the main reason for the fall in the Distrowatch rankings and the exodus from Ubuntu to the superior Linux Mint distribution. Linux Mint 12 has just been released and includes the Gnome 3 desktop with many enhancements for ease of use by those unfamiliar with Gnome 3/Gnome Shell.
http://www.linuxmint.com/download.php Download the Ubuntu successor now.