Welcome to GNU/Linux and welcome to LQ!
I agree, you should probably edit the subject line of your post to attract answers from people with the relevant knowledge.
For admin tasks such as installing software under Ubuntu I think that you will need to preface the command with 'sudo' and then provide your user password (Ubuntu does not have a root account as other distros).
I am not an Ubuntu user either, so will defer more specific answers to others - there are plenty here!
It will also be helpful to others helping you, if you can be a little more specific about each problem that you are having. Otherwise they have to first untangle the questions!