https://mirror.nishi.network/ubuntu/
http://www.ftp.ne.jp/Linux/packages/ubuntu/archive/
http://ftp.jaist.ac.jp/pub/Linux/ubuntu/
https://ftp.udx.icscoe.jp/Linux/ubuntu/
http://ubuntutym.u-toyama.ac.jp/ubuntu/
https://ftp.sakura.ad.jp/ubuntu/
https://jp.mirror.coganng.com/ubuntu-ports/
https://linux.yz.yamagata-u.ac.jp/ubuntu/
https://mirror.nishi.network/ubuntu-ports/
https://mirror.hashy0917.net/ubuntu-ports/
https://mirror.hashy0917.net/ubuntu/
http://archive.g4t1.pro/ubuntu/
https://repo.jing.rocks/ubuntu/
http://ftp.tsukuba.wide.ad.jp/Linux/ubuntu/
https://repo.jing.rocks/ubuntu-ports/
https://jp.mirror.coganng.com/ubuntu/
http://ftp.riken.jp/Linux/ubuntu/
http://archive.ubuntu.com/ubuntu/