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
# ip link set dev eth0 mtu 1400
我从这里 但你确定这是解决你的问题的办法吗？
答案2
要在 GUI 中更改 MTU：转到网络设置 -> 单击首选网络接口 > 您可以在那里更改 MTU
