Once BackTrack is installed on the harddrive, open the menu and goto K -> BackTrack -> Penetration -> Fast Track
type:
./fast-track.py -i
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Enter the Fast-Track updates menu (1).
Update everything (9).
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After the update finishes, select the Installation menu (8).
Install everything (8).
Go back to the Installation menu, select Install Slapt-Get (1)
Install Slapt-Get (2), then select update SlackWare (1).
Exit (10)

Now, you can use slapt-get to install packages from the slackware repositories. For example, if you want to install mozilla-thunderbird:
Make sure it exists in the repositories:
slapt-get --search thunderbird
if you find it, use the install parameter to install:
slapt-get --install mozilla-thunderbird-2.0.0.21-i686-1

snapshot2

you can also use the gui front-end for slapt-get, but it is broken by default in BT3. so let’s reinstall it:
slapt-get --install --reinstall gslapt

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