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"dpkg 'ldconfig' not found ..." error on Debian

When I tried to bootsrap a server into Chef, I faced with following error:

dpkg: warning: 'ldconfig' not found in PATH or not executable.
After a quick research, I found the exact answer. Sudoers file was defected. Following lines were missing:

Defaults   env_reset
Defaults   secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
After adding these lines into the file, the problem has been solved.
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