- 配置mirror.list
sudo nano /etc/apt/mirror.list
############# config ##################
set base_path /data/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 <running host architecture>
#set postmirror_script $var_path/postmirror.sh
#set run_postmirror 0
set nthreads 20
set _tilde 0
############# end config ##############
deb http://archive.ubuntu.com/ubuntu focal main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu focal-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu focal-proposed main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu focal-backports main restricted universe multiverse
#deb-src http://archive.ubuntu.com/ubuntu focal main restricted universe multiverse
#deb-src http://archive.ubuntu.com/ubuntu focal-security main restricted universe multiverse
#deb-src http://archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse
#deb-src http://archive.ubuntu.com/ubuntu focal-proposed main restricted universe multiverse
#deb-src http://archive.ubuntu.com/ubuntu focal-backports main restricted universe multiverse
clean http://archive.ubuntu.com/ubuntu