apt-mirror: can't create /media/ubunturepro/mirror directory at /usr/bin/apt-mirror line 342 onto SMB-Share NAS

mkdir /media/ubunturepo/mirror
chown -R $User /media/ubunturepo/

#apt-mirror configuration file

############# config ##################
#
set base_path    /media/ubunturepro
#
set mirror_path  $base_path/mirror
set skel_path    $base_path/skel
set var_path     $base_path/var
set cleanscript $var_path/clean.sh
# set defaultarch  <running host architecture>
# set postmirror_script $var_path/postmirror.sh
# set run_postmirror 0
set limit_rate 250k
set nthreads     20
set _tilde 0
#
############# end config ##############


deb-i386 http://archive.ubuntu.com/ubuntu bionic main restricted universe multiverse
deb-amd64 http://archive.ubuntu.com/ubuntu xenial main restricted universe multiverse