How to install Firefox with USB created from Knoppix 6.7 CD

[klaus2008]

Hi, Denver Dave!

I forgot to write how the Iceweasel web browser could be installed. I do it in a terminal with the commands

sudo apt-get update
sudo apt-get -t testing install iceweasel

The Knoppix V6.7.0 CD has Chromium web browser as default browser, but Knoppix V6.7.1 CD comes with Iceweasel.

Greetings

[Denver Dave]

root@Microknoppix:/home/knoppix# sudo apt-get update
Get:1 http://security.debian.org stable/updates Release.gpg [836 B]
Ign http://security.debian.org/ stable/updates/contrib Translation-en
Ign http://security.debian.org/ stable/updates/main Translation-en

[..... lines not shown]

Get:35 http://ftp.de.debian.org stable-updates/contrib i386 Packages [14 B]
Get:36 http://ftp.de.debian.org stable-updates/non-free i386 Packages [14 B]
Fetched 24.0 MB in 1min 29s (269 kB/s)
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

root@Microknoppix:/home/knoppix# sudo apt-get -t testing install iceweasel
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
root@Microknoppix:/home/knoppix#

= = = =
Maybe I need to get the 6.7.1 disk and maybe the DVD? I'm just trying to learn how knoppix works with regard to adding applications.