How to Activate The Shortcut Alt+F2 at Ubuntu 11.10 (Gnome Shell)

In Ubuntu, Alt+F2 is the shortcut to display the run command-prompt, which is a fast way to execute the commands other than through the Terminal. By default, this shortcut is not enabled in Gnome Shell so that you can not execute the commands through this key combination.

To enable this shortcut, go to the username in the top left panel and then select System Settings.

PDF Mod, A PDF Modifier for Linux

PDF Mod is a simple application for modifying PDF documents. You can reorder, rotate, and remove pages, export images from a document, edit the title, subject, author, and keywords, and combine documents via drag and drop. 

How to Overcome Double Tap & Hold of Touchpad Does Not Work Properly on Ubuntu 11.10

Double tap & hold of touchpad works to drag & drop an object. With this feature we will can drag & drop objects easily. On Ubuntu 11.10, double tap & hold of most netbook touchpad does not work well. Sometimes it can drag an object & sometimes it can't. How to fix this so that double tap & hold of touchpad functioning properly?

To overcome this, we must to set some parameters of Synaptics Touchpad by typing the following commands in Terminal.

sudo gedit /usr/share/X11/xorg.conf.d/50-synaptics.conf

Then add the following line before the EndSection script then save & restart your computer

Option "SingleTapTimeout" "320"
Option "FastTaps" "1"