Как я могу отразить несколько репозиториев apt-зеркала Ubuntu / Debian на одном сервере с помощью apt-mirror?

В моей студии есть какой-то сервер и ПК под управлением Ubuntu или Debian. Включите Ubuntu 16.04 / 18.04, Debian 8/9. И на сервере уже есть репозиторий Ubuntu 16.04 apt, синхронизируемый с интернет-зеркала каждый день. Теперь мне нужно развернуть репозиторий apt других выпусков на этом сервере. Как мне это сделать? Я настроил /etc/apt/mirror.list, как показано ниже, и запустил sudo apt-mirror.

############# config ##################
#
# set base_path    /var/spool/apt-mirror
#
# 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  amd64
# set postmirror_script $var_path/postmirror.sh
# set run_postmirror 0
set nthreads     20
set _tilde 0
#
############# end config ##############

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse

clean https://mirrors.tuna.tsinghua.edu.cn/ubuntu

deb https://mirrors.tuna.tsinghua.edu.cn/debian/ jessie main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ jessie-updates main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ jessie-backports main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian-security jessie/updates main contrib non-free

clean https://mirrors.tuna.tsinghua.edu.cn/debian

Но это показывает много ошибок, как это:

Failed to open Release file from https://mirrors.tuna.tsinghua.edu.cn/debian/dists/jessie-backports/Release at /usr/bin/apt-mirror line 507, <STREAM> line 5070.
Failed to open Release file from https://mirrors.tuna.tsinghua.edu.cn/debian/dists/jessie-backports/Release at /usr/bin/apt-mirror line 507, <STREAM> line 5070.
Failed to open Release file from https://mirrors.tuna.tsinghua.edu.cn/debian/dists/jessie-backports/Release at /usr/bin/apt-mirror line 507, <STREAM> line 5070.
Processing translation indexes: [TTTTTTTT]
Processing indexes: [PPPPPapt-mirror: can't open index mirrors.tuna.tsinghua.edu.cn/debian///dists/jessie-updates/main/binary-amd64/Packages in process_index at /usr/bin/apt-mirror line 800.
apt-mirror: can't open index mirrors.tuna.tsinghua.edu.cn/debian///dists/jessie-updates/contrib/binary-amd64/Packages in process_index at /usr/bin/apt-mirror line 800.
apt-mirror: can't open index mirrors.tuna.tsinghua.edu.cn/debian///dists/jessie-updates/non-free/binary-amd64/Packages in process_index at /usr/bin/apt-mirror line 800.
apt-mirror: can't open index mirrors.tuna.tsinghua.edu.cn/debian///dists/jessie-backports/main/binary-amd64/Packages in process_index at /usr/bin/apt-mirror line 800.
apt-mirror: can't open index mirrors.tuna.tsinghua.edu.cn/debian///dists/jessie-backports/contrib/binary-amd64/Packages in process_index at /usr/bin/apt-mirror line 800.
apt-mirror: can't open index mirrors.tuna.tsinghua.edu.cn/debian///dists/jessie-backports/non-free/binary-amd64/Packages in process_index at /usr/bin/apt-mirror line 800.

Кто-нибудь может дать какой-нибудь совет? Спасибо!