drivers for wifi broadcom bcm43142

[mk63]

Hi,
I cant connect to my wifi router in usb live session.
My laptop hp stream 13 has only wifi adapter.
I tried to install "bcmwl-kernel-source"
like this:

Code:

sudo apt-get install bcmwl-kernel-source

but there is no aditional drivers for my broadcom bcm43142 in live session.
My laptop has no wired connection to internet.
Please help me