I am using Raspberry Pi 3 Model B, and installed raspbian-buster on it.
sudo apt-get update
works well. But sudo apt-get upgrade
shows connection failed.
Err:29 http://archive.raspberrypi.org/debian buster/main armhf arandr all 0.1.9-2+rpt4
Connection failed [IP: 93.93.128.230 80]
Err:1 http://mirrors.ocf.berkeley.edu/raspbian/raspbian buster/main armhf cron armhf 3.0pl1-134
Connection failed [IP: 169.229.226.30 80]
Err:30 http://archive.raspberrypi.org/debian buster/main armhf libraspberrypi-doc armhf 1.20190620+1-1
Connection failed [IP: 93.93.130.39 80]
Err:2 http://mirrors.ocf.berkeley.edu/raspbian/raspbian buster/main armhf libk5crpyto3 armhf 1.17-3
Connection failed [IP: 169.229.226.30 80]
Err:31 http://archive.raspberrypi.org/debian buster/main armhf libraspberrypi-dev armhf 1.20190620+1-1
Connection failed [IP: 93.93.130.104 80]
..........
When I pinged to that IP addresses, there was no packet loss.
I tried sudo apt-get clean
, but the same problem still occurs.