刚输入第一条命令sudo aptitude install pv，Shell就给我报错了。错误信息如下：

1
Err http://debian.lcs.mit.edu/debian/ squeeze/main pv amd64 1.1.4-1 404 NOT Found

大概的意思是网络无法连接？输入cat /etc/issue看看系统版本。原来教程上用的Linux虚拟机镜像是超古老的Debian 6，都这么老的东西，源都坏了吧……看来要手动给Debian 6换个源。操作步骤如下：

  1. 修改源文件，删除旧的源，添加新的源

    1
    2
    3
    sudo vim /etc/apt/sources.list # 打开sources.list后，删掉文件里所有内容，加上下面两行
    deb http://archive.debian.org/debian squeeze main
    deb http://archive.debian.org/debian squeeze-lts main

  2. 以某种方式连入国际互联网

  3. 更新软件包信息库

    1
    sudo aptitude update

  4. 再次输入sudo aptitude install pv，接着Debian会问你Do you want to ignore this warning and proceed anyway？，你输入yes。若pv安装成功，你会看见：

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    user1@vm1:~$ sudo aptitude install pv
    The following NEW packages will be installed:
      pv
    0 packages upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
    Need to get 0 B/28.9 kB of archives. After unpacking 143 kB will be used.
    Selecting previously deselected package pv.
    (Reading database ... 39657 files and directories currently installed.)
    Unpacking pv (from .../archives/pv_1.1.4-1_amd64.deb) ...
    Processing triggers for man-db ...
    Setting up pv (1.1.4-1) ...