deb http://ftp.daumkakao.com/ubuntu/ focal main
deb http://archive.ubuntu.com/ubuntu/ focal main

deb http://ftp.daumkakao.com/ubuntu/ focal universe
deb http://archive.ubuntu.com/ubuntu/ focal universe

deb http://ftp.daumkakao.com/ubuntu/ focal multiverse
deb http://archive.ubuntu.com/ubuntu/ focal multiverse

deb http://ftp.daumkakao.com/ubuntu/ focal restricted
deb http://archive.ubuntu.com/ubuntu/ focal restricted