sudo gedit /etc/apt/mirror.list
…
############# config ##################
#
set base_path /media/sda6/var/spool/apt-mirror
#
# if you change the base path you must create the directories below with write privlages
#
set mirror_path $base_path/mirror
set skel_path $base_path/skel
set var_path $base_path/var
# set cleanscript