Bulk rename in GNOME
It is not possible to rename everyfile at a time in GNOME. You will have to rename every file one by one and it is a tedious job after all.
The solution for it is to use the Renamer Nautilus Script. Renamer is a small python script for batch renaming files in nautilus.
Download the Renamer Script from HERE and save it in home folder.
To install Renamer in ubuntu run the following commands in terminal
sudo apt-get install python-notify
tar -xzvf 87601-nautilus-renamer.tar.gz (extracting the tar)
cd nautilus-renamer (changing the directory)
sh install.sh
Now onwards when you right click on a file there will be option for scripts renamer
