小编sou*_*uha的帖子

我正在使用Ubuntu 14.04。我试图在软件和更新中修改服务器，但失败了。因此，当我尝试使用更新时 sudo apt-get update出现此错误：

W: Failed to fetch http://ppa.launchpad.net/ripps818/coreavc/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/main/binary-amd64/Packages  404  Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/universe/binary-amd64/Packages  404  Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/restricted/binary-amd64/Packages  404  Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/multiverse/binary-amd64/Packages  404  Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/main/binary-i386/Packages  404  Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/universe/binary-i386/Packages  404  Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/restricted/binary-i386/Packages  404  Not Found
W: Failed to fetch   http://ubuntu.mirror.tn/dists/trusty/multiverse/binary-i386/Packages  404 …

我正在执行一个简单的 makefile，其中包含 3 个部分，但它不能很好地工作，这些是我的文件 .h 和 .c 的详细信息：

1. 主程序

   #include <stdio.h>
   #include <stdlib.h>
   #include "hello.h"
   
   int main (void)
   {
        hello();
        return EXIT_SUCCESS;
   }
   

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2. 你好.h

   #ifndef hello
       #define hello
       void hello (void);
   #endif
   

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3. 你好ç

   #include <stdio.h>
   #include <stdlib.h>
   
   void hello (void)
   {
       printf("Hello World\n");
   }
   

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4. 生成文件

   all: hello
   hello: hello.o main.o
        gcc -o hello hello.o main.o
   
   hello.o: hello.c
        gcc -o hello.o -c hello.c -W -Wall -ansi -pedantic
   
   main.o: main.c hello.h
       gcc -o main.o -c main.c -W -Wall -ansi -pedantic
   
   clean:
        rm …

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