apt-get更新和安装Curl的问题

Question

I am trying to install CURL for PHP. I have setup a Ubuntu 14 server.

I am running

sudo apt-get update && install php5-curl

I am getting the following error

Err http://us.archive.ubuntu.com trusty InRelease

Err http://us.archive.ubuntu.com trusty-updates InRelease

Err http://us.archive.ubuntu.com trusty-backports InRelease

Err http://security.ubuntu.com trusty-security InRelease

Err http://us.archive.ubuntu.com trusty Release.gpg
Could not resolve 'host'
Err http://us.archive.ubuntu.com trusty-updates Release.gpg
Could not resolve 'host'
Err http://security.ubuntu.com trusty-security Release.gpg
Could not resolve 'host'
Err http://us.archive.ubuntu.com trusty-backports Release.gpg
Could not resolve 'host'
Reading package lists... Done
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/InRelease  

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/InRelease  

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/InRelease  

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/InRelease  

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty/Release.gpg  Could not resolve 'host'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/Release.gpg  Could not resolve 'host'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/Release.gpg  Could not resolve 'host'

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/Release.gpg  Could not resolve 'host'

W: Some index files failed to download. They have been ignored, or old ones used instead.
install: missing destination file operand after ‘php5-curl’
Try 'install --help' for more information.

There are a few errors with sudo apt-get updated too. When I try to do

ping us.archive.ubuntu.com

I am getting a response.

If I try to do a standalone

sudo apt-get install php5-curl

I get the following error

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package php5-curl

Please help.

Answer 1

Guarav -

You are running into issues with the apt-get update command, and subsequently having an issue installing the php5-curl package.

You stated you are able to ping us.archive.ubuntu.com though, so domain name resolution is occurring, but it does not work with apt-get. Apt-get has a lot of problems I've experienced with IPv6 on certain networks. Try running the update with just IPv4 with this:

apt-get -o Acquire::ForceIPv4=true update

And if that works, you can disable IPv6 permanently by creating a file in the /etc/apt/apt.conf.d/ folder (it can be named anything, for example 99force-ipv4) with this line in it:

Acquire::ForceIPv4 "true";