root@JudgeServer:/etc/apt# vi sources.list
root@JudgeServer:/etc/apt# sudo apt update
Get:1 http://mirror.kakao.com/ubuntu xenial InRelease [247 kB]
Get:2 http://mirror.kakao.com/ubuntu xenial-updates InRelease [109 kB]
Get:3 http://mirror.kakao.com/ubuntu xenial-backports InRelease [107 kB]
Hit:4 https://deb.nodesource.com/node_12.x xenial InRelease
Get:5 http://mirror.kakao.com/ubuntu xenial/main amd64 Packages [1,201 kB]
Get:6 http://mirror.kakao.com/ubuntu xenial/main i386 Packages [1,196 kB]
Get:7 http://mirror.kakao.com/ubuntu xenial/main Translation-en [568 kB]
Get:8 http://mirror.kakao.com/ubuntu xenial/main Translation-ko [80.2 kB]
Get:9 http://mirror.kakao.com/ubuntu xenial/restricted amd64 Packages [8,344 B]
Get:10 http://mirror.kakao.com/ubuntu xenial/restricted i386 Packages [8,684 B]
Get:11 http://mirror.kakao.com/ubuntu xenial/restricted Translation-en [2,908 B]
Get:12 http://mirror.kakao.com/ubuntu xenial/restricted Translation-ko [716 B]
Get:13 http://mirror.kakao.com/ubuntu xenial/universe amd64 Packages [7,532 kB]
Get:14 http://security.ubuntu.com/ubuntu xenial-security InRelease [109 kB]
Hit:15 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu xenial InRelease
Get:16 http://mirror.kakao.com/ubuntu xenial/universe i386 Packages [7,512 kB]
Get:17 http://mirror.kakao.com/ubuntu xenial/universe Translation-en [4,354 kB]
Get:19 http://mirror.kakao.com/ubuntu xenial/universe Translation-ko [158 kB]
Get:20 http://mirror.kakao.com/ubuntu xenial/multiverse amd64 Packages [144 kB]
Get:21 http://mirror.kakao.com/ubuntu xenial/multiverse i386 Packages [140 kB]
Get:22 http://mirror.kakao.com/ubuntu xenial/multiverse Translation-en [106 kB]
Get:23 http://mirror.kakao.com/ubuntu xenial-updates/main amd64 Packages [1,131 kB]
Get:24 http://mirror.kakao.com/ubuntu xenial-updates/main i386 Packages [913 kB]
Get:25 http://mirror.kakao.com/ubuntu xenial-updates/main Translation-en [429 kB]
Get:26 http://mirror.kakao.com/ubuntu xenial-updates/restricted amd64 Packages [7,616 B]
Get:27 http://mirror.kakao.com/ubuntu xenial-updates/restricted i386 Packages [7,580 B]
Get:28 http://mirror.kakao.com/ubuntu xenial-updates/restricted Translation-en [2,272 B]
Get:29 http://mirror.kakao.com/ubuntu xenial-updates/universe amd64 Packages [796 kB]
Get:30 http://mirror.kakao.com/ubuntu xenial-updates/universe i386 Packages [721 kB]
Get:31 http://mirror.kakao.com/ubuntu xenial-updates/universe Translation-en [333 kB]
Get:32 http://mirror.kakao.com/ubuntu xenial-updates/multiverse amd64 Packages [16.8 kB]
Get:33 http://mirror.kakao.com/ubuntu xenial-updates/multiverse i386 Packages [15.9 kB]
Get:34 http://mirror.kakao.com/ubuntu xenial-updates/multiverse Translation-en [8,468 B]
Get:35 http://mirror.kakao.com/ubuntu xenial-backports/main amd64 Packages [7,280 B]
Get:36 http://mirror.kakao.com/ubuntu xenial-backports/main i386 Packages [7,288 B]
Get:37 http://mirror.kakao.com/ubuntu xenial-backports/main Translation-en [4,456 B]
Get:38 http://mirror.kakao.com/ubuntu xenial-backports/universe amd64 Packages [8,064 B]
Get:39 http://mirror.kakao.com/ubuntu xenial-backports/universe i386 Packages [7,744 B]
Get:40 http://mirror.kakao.com/ubuntu xenial-backports/universe Translation-en [4,328 B]
Hit:18 http://mariadb.mirror.liquidtelecom.com/repo/10.3/ubuntu xenial InRelease
Fetched 28.0 MB in 6s (4,180 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done