出现了以下情况：
After this operation, 163 MB of additional disk space will be used.
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perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = "zh_CN:zh",
LC_ALL = (unset),
LC_TIME = "zh_CN",
LC_MONETARY = "zh_CN",
LC_ADDRESS = "zh_CN",
LC_TELEPHONE = "zh_CN",
LC_NAME = "zh_CN",
LC_MEASUREMENT = "zh_CN",
LC_IDENTIFICATION = "zh_CN",
LC_NUMERIC = "zh_CN",
LC_PAPER = "zh_CN",
LANG = "zh_CN.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
Can't exec "locale": No such file or directory at /usr/share/perl5/Debconf/Encoding.pm line 16.
Use of uninitialized value $Debconf::Encoding::charmap in scalar chomp at /usr/share/perl5/Debconf/Encoding.pm line 17.
Extracting templates from packages: 100%
Preconfiguring packages ...
dpkg: warning: 'ldconfig' not found in PATH or not executable
dpkg: error: 1 expected program not found in PATH or not executable
Note: root's PATH should usually contain /usr/local/sbin, /usr/sbin and /sbin
E: Sub-process /usr/bin/dpkg returned an error code (2)
解决办法：
从其他一台ubuntu上scp了 /sbin/ldconfig和 /sbin/ldconfig.real 过来。