Following are the Ubuntu system requirements.
Processor Requirements
Ubuntu runs on:
- x86 and compatible processors
- 64-bit AMD and 64-bit Intel processors
- Sun UltraSPARC
- G3 or higher PowerPC
Requirements are for a 300 MHz or higher processor, with 700 MHz or higher being preferred.
RAM Requirements
Minimum requirement is for 64MB, but 384MB or higher is recommended.
Hard Disk Space
For a full installation at least 4GB hard disk or SSD space is recommended. It is possible to install a reduced version at 1.5GB, but this is not recommended for beginners, since the out-of-the-box installation should be the preferred mode. Obviously you want additional space so that you can install additional packages, as well as save files. How much you will need is up to you, but Ubuntu recommends that you have at least an additional 4GB at the time of installation.
Graphics
There is a little bit of leeway here, because this does depend on what you need specifically, generally a VGA card capable of 640x480 resolution is enough, anything better is preferable. These days 1024x768 should be pretty standard.
Other Requirements
A CD-ROM or DVD-drive is pretty much a given, because that is probably how you are going to install the system. An Ethernet card is always good to have. As for Wireless, here is where you’ll have to do a little bit of research to get your existing wireless card to work with Ubuntu. The Ubuntu Wiki lists all supported Wireless cards. You can very easily buy cheap used wireless cards that are known to work with Ubuntu on EBay. I have first hand bought such cards for under $10 including shipping. Most current sound cards should work automatically. For specific issues, getting certain hardware to work, you can always look up forums online.