ubuntu 14.04 wifi and Ethernet doesn't works

Question

i've just install Ubuntu 14.04 from a key on my computer, I have already installed 5 time ubuntu on other computer, but for this one, i can't connect to internet at all...

And i have try every solution i could find on internet !

So, first of all, ubuntu doesn't find any wifi connection, so i try to connect to Ethernet: Wired connection 1 doesn't work...

I try this:

lspci -knn | grep Net -A2

it say:

02:00.0 Network controller [0280]: Broadcom Corporation BCM43142 

   802.11b/g/n [14e4:4365] (rev 01)
   Subsystem: Lenovo Device [17aa:0611]
   Kernel_driver in use: bcma-pci-bridge

i don't know what is it... so let's try another solution, when i set these following line:

lspci -n | egrep '0200|0280' | awk '{print$3}'

it say:

1969:10a0
14e4:4365

So I try to do these following line:

sudo apt-get remove --purge bcmwl-kernel-source
sudo rm /etc/modprobe.d/blacklist-bcm43.conf #its ok if this command does nothing or fails
sudo modprobe b44

But the first line fails, the second too, and the third seems to works.. (but i'm not sure there are no outputs...)

EDIT: i did what suggested here: How to install Broadcom wireless drivers offline?

first i cp pool/main/d/dkms/dkms_XXXXX.deb and pool/restricted/b/bcmwl/bcmwl-kernel-source_XXXXX.deb from my key in my home, then i did sudo dpkg -i *.deb. Then i download this: http://mirrors.kernel.org/ubuntu/pool/restricted/b/bcmwl/bcmwl-kernel-source_6.30.223.248+bdcom-0ubuntu0.2_amd64.deb (64-BIT DRIVER FROM UBUNTU REPOSITORY) and I retry dpkg again: not working... (reboot done)

Here is my screenshot: (after trying to dpkg the 2 .deb in my bottable key, i download the 64BIT-DRIVER in an other key and i retry like I said to dkpg the downloaded one)

EDIT 2: Ok, it seems i have installed a wrong version... How can i remove driver i've just downloaded ?

So I recap: I have from my key bootable ubuntu 14.04:

dkms_2.2.0.3-1.1ubuntu5.14.04_all.deb
bcmwl-kernel-source_6.30.223.141+bdcom-Oubuntu2_amd64.deb

and from the answer here: How to change desktop background from command line in Unity? i have these one:

bcmwl-kernel-source_6.30.223.248+bdcom-Oubuntu0.2_amd64.deb
dkms_2.2.0.3-1.1ubuntu5.14.04.5_all.deb

I have the 4 of them in my desktop... i think i install the 4 of them... how can i know which one i have, how can i delete the one i don't need ?

Thanks !