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I have installed Ubuntu server 14.04 on virtual box along with putty and Winscp for ftp requirements.I need to install some packages in to that but if I write 

sudo apt-get install openjdk-7-jre

... it gives "Unable to locate the package".
However if I simply use:

sudo apt-get update

then also it returns error

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/Release.gpg  Could not resolve 'security.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.

It seems there is some issue with sources.list file, I have already checked it with possibilities of errors but could not find any fix for that. Can anybody help me out of this. Thanks

Byte Commander
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Vipul
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    Could you check if you can resolve the server name using `nslookup security.ubuntu.com` and reach it using `ping security.ubuntu.com`? – Byte Commander Mar 15 '16 at 08:16
  • Yes i can do that Server: 4.2.2.2 Address: 4.2.2.2#53 – Vipul Mar 15 '16 at 10:34
  • The `nslookup` output should contain several lines like this: `Name: security.ubuntu.com` `Address: 91.189.88.149` - doesn't it? – Byte Commander Mar 15 '16 at 10:44
  • Yes those lines are there. – Vipul Mar 15 '16 at 11:03
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    I am getting this error when I am using apt-get updateE: GPG error: http://in.archive.ubuntu.com trusty InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?) – Vipul Mar 15 '16 at 11:09
  • Then please look at this question and follow the proposed solutions: http://askubuntu.com/questions/474549/got-nodata-issue-nodata-does-the-network-require-authentication – Byte Commander Mar 15 '16 at 11:12
  • I gone through the link but could not find any solution from there – Vipul Mar 16 '16 at 05:32
  • What do you mean by "could not find any solution from there"? You tried all the given solutions and still get the NODATA error? Did you already try a different internet connection? – Byte Commander Mar 16 '16 at 07:36
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    Does this answer your question? [Got NODATA issue: 'NODATA' (does the network require authentication?)](https://askubuntu.com/questions/474549/got-nodata-issue-nodata-does-the-network-require-authentication) – karel Feb 08 '20 at 05:41

0 Answers0