Wow. I am really hating this new Blogger interface. I just managed to completely delete the post again. "Revert to Draft" doesn't mean revert to original content when you edit an existing post, it just completely erases the existing content. Then, when you hit the "Close" button, the now blank post is saved, thereby losing your content.
In any case, the original post griped about Unity's auto-hiding global menubar, and gave a tip to remove it, which is to remove the package that provides that feature:
sudo apt-get purge indicator-appmenu
If you want to completely revert Ubuntu to a stock GNOME 3 UI, there are extensive instructions here. In particular, the crazy disappearing scrollbar handles which are as easy to grab onto as eels.