问题：在jetson orin nx设备上使用apt-get是保错，但ping www.baidu.com是通的。导致无法使用apt-get安装软件包。
Could not connect to repo.download.nvidia.com:80 (2.20.134.136), connection timed out Could not connect to repo.download.nvidia.com:80 (2.20.134.139), connection timed out
Err:2 http://repo.download.nvidia.com/jetson/t234 r35.6 InRelease
Unable to connect to repo.download.nvidia.com:http:
Err:3 http://repo.download.nvidia.com/jetson/ffmpeg r35.6 InRelease
Unable to connect to repo.download.nvidia.com:http:
Err:4 http://security.ubuntu.com/ubuntu xenial-security InRelease
Cannot initiate the connection to security.ubuntu.com:80 (2620:2d:4002:1::103). - connect (101: Network is unreachable) Cannot initiate the connection to security.ubuntu.com:80 (2620:2d:4002:1::102). - connect (101: Network is unreachable) Cannot initiate the connection to security.ubuntu.com:80 (2620:2d:4002:1::101). - connect (101: Network is unreachable) Could not connect to security.ubuntu.com:80 (91.189.91.83), connection timed out Could not connect to security.ubuntu.com:80 (91.189.91.81), connection timed out Could not connect to security.ubuntu.com:80 (91.189.91.82), connection timed out
Err:5 http://packages.ros.org/ros/ubuntu focal InRelease
Cannot initiate the connection to packages.ros.org:80 (2600:3402:200:227::2). - connect (101: Network is unreachable) Cannot initiate the connection to packages.ros.org:80 (2600:3404:200:237::2). - connect (101: Network is unreachable) Cannot initiate the connection to packages.ros.org:80 (2605:bc80:3010::134). - connect (101: Network is unreachable) Could not connect to packages.ros.org:80 (64.50.233.100), connection timed out Could not connect to packages.ros.org:80 (64.50.236.52), connection timed out Could not connect to packages.ros.org:80 (140.211.166.134), connection timed out
Err:6 http://packages.ros.org/ros2/ubuntu focal InRelease
Cannot initiate the connection to packages.ros.org:80 (2600:3402:200:227::2). - connect (101: Network is unreachable) Cannot initiate the connection to packages.ros.org:80 (2600:3404:200:237::2). - connect (101: Network is unreachable) Cannot initiate the connection to packages.ros.org:80 (2605:bc80:3010::134). - connect (101: Network is unreachable)
Err:7 http://ports.ubuntu.com/ubuntu-ports focal InRelease
Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4000:1::19). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10c). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10b). - connect (101: Network is unreachable) Could not connect to ports.ubuntu.com:80 (91.189.91.104), connection timed out Could not connect to ports.ubuntu.com:80 (185.125.190.36), connection timed out Could not connect to ports.ubuntu.com:80 (91.189.91.102), connection timed out
Err:8 http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease
Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4000:1::19). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10c). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10b). - connect (101: Network is unreachable)
Err:9 http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease
Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4000:1::19). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10c). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10b). - connect (101: Network is unreachable)
Err:10 http://ports.ubuntu.com/ubuntu-ports focal-security InRelease
Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4000:1::19). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10c). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10b). - connect (101: Network is unreachable)
Reading package lists... Done
W: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/focal/InRelease Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4000:1::19). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10c). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10b). - connect (101: Network is unreachable) Could not connect to ports.ubuntu.com:80 (91.189.91.104), connection timed out Could not connect to ports.ubuntu.com:80 (185.125.190.36), connection timed out Could not connect to ports.ubuntu.com:80 (91.189.91.102), connection timed out
W: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/focal-updates/InRelease Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4000:1::19). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10c). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10b). - connect (101: Network is unreachable)
W: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/focal-backports/InRelease Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4000:1::19). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10c). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10b). - connect (101: Network is unreachable)
W: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/focal-security/InRelease Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4000:1::19). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10c). - connect (101: Network is unreachable) Cannot initiate the connection to ports.ubuntu.com:80 (2620:2d:4002:1::10b). - connect (101: Network is unreachable)
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/InRelease Cannot initiate the connection to security.ubuntu.com:80 (2620:2d:4002:1::103). - connect (101: Network is unreachable) Cannot initiate the connection to security.ubuntu.com:80 (2620:2d:4002:1::102). - connect (101: Network is unreachable) Cannot initiate the connection to security.ubuntu.com:80 (2620:2d:4002:1::101). - connect (101: Network is unreachable) Could not connect to security.ubuntu.com:80 (91.189.91.83), connection timed out Could not connect to security.ubuntu.com:80 (91.189.91.81), connection timed out Could not connect to security.ubuntu.com:80 (91.189.91.82), connection timed out
W: Failed to fetch http://repo.download.nvidia.com/jetson/common/dists/r35.6/InRelease Could not connect to repo.download.nvidia.com:80 (2.20.134.136), connection timed out Could not connect to repo.download.nvidia.com:80 (2.20.134.139), connection timed out
W: Failed to fetch http://repo.download.nvidia.com/jetson/t234/dists/r35.6/InRelease Unable to connect to repo.download.nvidia.com:http:
W: Failed to fetch http://repo.download.nvidia.com/jetson/ffmpeg/dists/r35.6/InRelease Unable to connect to repo.download.nvidia.com:http:
W: Failed to fetch http://packages.ros.org/ros/ubuntu/dists/focal/InRelease Cannot initiate the connection to packages.ros.org:80 (2600:3402:200:227::2). - connect (101: Network is unreachable) Cannot initiate the connection to packages.ros.org:80 (2600:3404:200:237::2). - connect (101: Network is unreachable) Cannot initiate the connection to packages.ros.org:80 (2605:bc80:3010::134). - connect (101: Network is unreachable) Could not connect to packages.ros.org:80 (64.50.233.100), connection timed out Could not connect to packages.ros.org:80 (64.50.236.52), connection timed out Could not connect to packages.ros.org:80 (140.211.166.134), connection timed out
W: Failed to fetch http://packages.ros.org/ros2/ubuntu/dists/focal/InRelease Cannot initiate the connection to packages.ros.org:80 (2600:3402:200:227::2). - connect (101: Network is unreachable) Cannot initiate the connection to packages.ros.org:80 (2600:3404:200:237::2). - connect (101: Network is unreachable) Cannot initiate the connection to packages.ros.org:80 (2605:bc80:3010::134). - connect (101: Network is unreachable)
W: Some index files failed to download. They have been ignored, or old ones used instead.
解决：更换国内源
1.打开sources.list
# 备份原文件
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
# 编辑源列表（针对Ubuntu 20.04 focal，若为其他版本需对应修改）
sudo vim /etc/apt/sources.list
替换内容为清华源镜像（ARM 架构，适合 Jetson 设备）：
2.粘贴以下内容
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-security main restricted universe multiverse
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-security main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic main universe restricted
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic main universe restricted
3.更新apt-get
sudo apt-get update