I would like to learn to use Ubuntu in detail. Please tell me where to get auser's guide or a comprehensive manual for everything.
http://ubuntuguide.org/....................
ubuntuforums.com. any bookstore with a decent computer section.
I would suggest you to buy books for ubuntu. There areI got the following search result from amazonhttp://www.amazon.com/s?url=search-alias%3Dstripbooks&field-keywords=ubuntu+linu\xFor beginners you can start herehttps://help.ubuntu.com/Book is a great thing to start with.There are a lot of online resources too for more newer problemshttp://ubuntuforums.comORhttp://ubuntuguide.orgORany such online forums