sudo apt update
sudo apt upgrade
sudo vi /etc/apt/sources.list
- #deb http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi
+ #deb http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi
# Uncomment line below then 'apt-get update' to enable 'apt-get source'
#deb-src http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi
+ deb http://ftp.jaist.ac.jp/raspbian buster main contrib non-free rpi