change-ubuntu-mirror.sh

#!/bin/sh
SL=/etc/apt/sources.list
cp ${SL} ${SL}.org
## 
sed -e 's/\(us.\)\?archive.ubuntu.com/ftp.daumkakao.com/g' -e 's/security.ubuntu.com/ftp.daumkakao.com/g' < ${SL}.org > ${SL}
## check
apt update

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