So, I installed Ubuntu 14.04 today, and everytime I log in in the GUI (Unity), my PC crashes. This also happened when I tried Ubuntu 13.10 last year, so I figured, it must be my graphics card. I have a GeForce 6150 SE nForce 430. Strangely this never happened with Ubuntu 11.04 WUBI. I am almost sure my GPU is the problem, so I want to try the MATE desktop.

Now, I know how to boot into the command line interface, so that isn't a problem. However, I can't seem to connect to the internet. I enter the `iwconfig wlan0 essid "My router" key"My wep password"`. This seems to go okay. And when I insert `dhclient wlan0` The screen goes to the next line, but I can't enter any commands, it just stays blank forever.
You know how it always says `"pcname"@ubuntu:~#` but when I entered the dhclient, that goes away. (I know I'm explaining very basic here, but you get the point)

So I wondered if anyone could tell me which commands to enter, step by step about how to connect to wifi (Wep or wpa, doesn't matter I have 2 routers. LAN is also fine) and then install MATE desktop? Thanks in advance.