我在用apt-get install tftp-hpa tftpd-hpa命令安装tftp的时候就会出现下面的错误：
Preconfiguring packages ...
dpkg: warning: 'ldconfig' not found on PATH.
dpkg: warning: 'start-stop-daemon' not found on PATH.
dpkg: warning: 'update-rc.d' not found on PATH.
dpkg: 3 expected program(s) not found on PATH.
NB: root's PATH should usually contain /usr/local/sbin, /usr/sbin and /sbin.
E: Sub-process /usr/bin/dpkg returned an error code (2)
哪位大神知道解决方法 求解求解。
