Whenever I try installing something I get a error. In a terminal I always get some error. In the Software Center fails. It tells me to check my Internet connection, even when I have an Ethernet cable attached to the WI-FI router.
When I try to download with the browser, opening the with the Archive Manager or saving it happens the same. I've even tried to use Flash-Aid. There seems to be a problem with my proxy or something.
I somehow managed to install Adobe Reader but I don't actually know how. I've read step by step guides but they use computer jargon that I can't understand.