How can i learn CCNA using Ubuntu instead Windows OSs

I just begin course of CCNA and i just notice that all work on windows ..

so my question have two parts first , can i learn and training on ccna using linux /Ubuntu??

second . if yes, how can i use it and is there any changes in writing order and cisco packet tracer

GNS3 is a graphical network simulator that allows simulation of complex networks.

To provide complete and accurate simulations, GNS3 is strongly linked with:

• Dynamips, a Cisco IOS emulator.
• Dynagen, a text-based front end for Dynamips.
• Qemu, a generic and open source machine emulator and virtualizer.
• VirtualBox, a free and powerful virtualization software.

GNS3 is an excellent complementary tool to real labs for network engineers, administrators and people wanting to study for certifications such as Cisco CCNA, CCNP, CCIP and CCIE as well as Juniper JNCIA, JNCIS and JNCIE.¹

To install just click on the image below:

^1Source:GNS3