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I am currently on Ubuntu 14.04 in VMware Workstation12. I tried install cmake 3.6.2 at first, while I get the error 

Could NOT find CURL (missing: CURL_LIBRARY CURL_INCLUDE_DIR)

Then I searched it on the Internet, get this answer http://www.cnblogs.com/suyuan1573/p/4251389.html, when run sudo apt-get upgrade, get 

E: GPG error: http://ubuntu.cn99.com precise InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)

I looked into multiple solution on the Internet including these

All doesn't work for me.

How to solve the problem? Thanks, allanna.

I don't wanna re-install Ubuntu, now I can't install any software. When I type apt-get update, I get E: GPG error: http://ubuntu.cn99.com precise InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)

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hoboh
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    The last command was failing for predictably, because Ubuntu 10.10 is end-of-life long ago. – Anwar Oct 13 '16 at 13:38
  • Thank u, but how to fix "Could NOT find CURL (missing: CURL_LIBRARY CURL_INCLUDE_DIR)", I've spent about one day to install cmake. I'm almost corrupted. Thank u for your help , I'm new to ubuntu too – hoboh Oct 13 '16 at 13:54

1 Answers1

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It's about proxy problem. I altered the proxy links. Firstly backup the proxy list:

sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup

Then open sources.list with gedit or other editor:

sudo gedit /etc/apt/sources.list

Choose the approxiate list for u, I'm in China, this works well:

deb http://mirrors.163.com/ubuntu/ trusty main restricted universe multiverse

ps: delete the original list

Finally, run 

sudo apt-get upadate
Anwar
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hoboh
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