ubuntu14.04无法安装Curl,需要先升级sudo apt-get update

sudo apt-get update

sudo apt-get install curl

-------------------------------

以下是没升级前报错内容

Do you want to continue [Y/n]? y

Err http://mirrors.sohu.com/ubuntu/ precise-security/main libcurl3 amd64 7.22.0-3ubuntu4.14

404 Not Found

Err http://mirrors.sohu.com/ubuntu/ precise-security/main curl amd64 7.22.0-3ubuntu4.14

404 Not Found

Failed to fetch http://mirrors.sohu.com/ubuntu/pool/main/c/curl/libcurl3_7.22.0-3ubuntu4.14_amd64.deb 404 Not Found

Failed to fetch http://mirrors.sohu.com/ubuntu/pool/main/c/curl/curl_7.22.0-3ubuntu4.14_amd64.deb 404 Not Found

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

user@ip82:~$ sudo add-apt-repository ppa:costamagnagianfranco/ettercap-stable-backports

sudo: add-apt-repository: command not found

user@ip82:~$