This question already has an answer here:
- How do I install Ubuntu? 2 answers
I have ubuntu 11.04 installed in my PC. Now, the system does not allow me to update or upgrade anything. So, I would like to use one of your LTS version. I prefer 14.04, as it is new. I am having a dual booting PC with ubuntu 11.04 and windows-7. I want to remove ubuntu 11.04 and in its place I would like to install 14.04. So, kindly suggest me how can I proceed with installation.