第二次安装直接卡在如下画面：
the following extra packages will be installed:
lockifle-progs
the following new packages will be installed:
lockfile-progs ntpdate作者: licess 时间: 2014-6-5 20:25
Err http://security.debian.org/ squeeze/updates/main libcurl3-gnutls amd64 7.21.0-2.1+squeeze8
Cannot initiate the connection to security.debian.org:80 (2001:8d8:580:400:6564:a62:0:2). - connect (101: Network is unreachable) [IP: 2001:8d8:580:400:6564:a62:0:2 80]
Get:1 http://debian.csie.nctu.edu.tw/debian/ squeeze/main libxmlrpc-c3 amd64 1.06.27-1.1 [262 kB]
Get:2 http://debian.csie.nctu.edu.tw/debian/ squeeze/main emacsen-common all 1.4.22 [18.8 kB]
Get:3 http://debian.csie.nctu.edu.tw/debian/ squeeze/main cmake-data all 2.8.2+dfsg.1-0+squeeze1 [1,212 kB]
Get:4 http://debian.csie.nctu.edu.tw/debian/ squeeze/main cmake amd64 2.8.2+dfsg.1-0+squeeze1 [4,735 kB]
Failed to fetch http://security.debian.org/pool/updates/main/c/curl/libcurl3-gnutls_7.21.0-2.1+squeeze8_amd64.deb Cannot initiate the connection to security.debian.org:80 (2001:8d8:580:400:6564:a62:0:2). - connect (101: Network is unreachable) [IP: 2001:8d8:580:400:6564:a62:0:2 80]
Fetched 6,227 kB in 26s (232 kB/s)
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?