Copied from terminal:
tux@slitaz:~$ tazpkg get-install linux-agp
You must be root to run tazpkg with this option.
Please type 'su' and root password to become super-user.
tux@slitaz:~$ su root tazpkg get-install linux-agp
Password:
su: incorrect password
tux@slitaz:~$ su tazpkg get-install linux-agp
su: unknown user tazpkg
tux@slitaz:~$ root tazpkg get-install linux-agp
/bin/sh: root: not found
tux@slitaz:~$
I think I went through all options.