我需要MTU在新安装的 ubuntu 18.04 中更改大小。这可以通过 来完成ifconfig。但我无法安装ifconfig。每当我运行命令时sudo apt install net-tools，我都会收到以下错误。
Err:1 http://archive.ubuntu.com/ubuntu bionic/main amd64 net-tools amd64 1.60+git20161116.90da8a0-1ubuntu1
Could not resolve 'archive.ubuntu.com'
E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/n/net-tools/net-tools_1.60+git20161116.90da8a0-1ubuntu1_amd64.deb Could not resolve 'archive.ubuntu.com'
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
然后我尝试sudo apt-get update并得到以下结果
asif@asif-HP:~$ sudo apt-get update
Hit:1 http://dl.google.com/linux/chrome/deb stable InRelease
Err:2 http://archive.ubuntu.com/ubuntu bionic InRelease
Could not resolve 'archive.ubuntu.com'
Err:3 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
Could not resolve 'archive.ubuntu.com'
Err:4 http://archive.ubuntu.com/ubuntu bionic-backports InRelease
Could not resolve 'archive.ubuntu.com'
Err:5 http://archive.ubuntu.com/ubuntu bionic-security InRelease
Could not resolve 'archive.ubuntu.com'
Err:6 http://archive.canonical.com/ubuntu bionic InRelease
Could not resolve 'archive.canonical.com'
Reading package lists... Done
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic/InRelease Could not resolve 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease Could not resolve 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease Could not resolve 'archive.ubuntu.com'
W: Failed to fetch http://archive.canonical.com/ubuntu/dists/bionic/InRelease Could not resolve 'archive.canonical.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-security/InRelease Could not resolve 'archive.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.
实际上，我正在尝试更改 MTU 大小来解决问题Could not resolve 'archive.canonical.com'，所以我有点陷入僵局。我现在该怎么办？
注意：我更改了 ubuntu 存档服务器但总是出现同样的错误。
答案1
您可以使用ip，它应该已经安装。例如，
ip link set mtu 1200 eth0