I am trying to sketch pcb and mechanical drawings of the electronic device. Are there any application which is available for Ubuntu 12.04 ?
Note : Application should suggest left-right-up-down arrow
I recommend Electric for beginners as an easy to use software that will handle both basic PCB layout and also basic electro-mechanical drawings.
It has a very nice online/PDF manual available here.
Here's a sample screenshot with all it's capabilities (from their website; ignore the Windows, the software is in Java and runs fantastically on Ubuntu):
For a much more comprehensive suite of EDA tools, look at gEDA . This will let you lay out complicated PCBs, schematics, VLSI design, SPICE simulation, etc.