通过查看日志:

/var/log/auth.log

报错:

su[9959]: PAM unable to dlopen(pam_rootok.so): /lib/security/pam_rootok.so: cannot open shared object file: No such file or directory

su[9959]: PAM adding faulty module: pam_rootok.so

su[9959]: PAM unable to dlopen(pam_unix.so): /lib/security/pam_unix.so: cannot open shared object file: No such file or directory

su[9959]: PAM adding faulty module: pam_unix.so

su[9959]: pam_authenticate: Authentication failure

su[9959]: FAILED su for root by dev

su[9959]: - /dev/pts/27 dev:root

解决办法:apt-get install libpcre3 login

注意:如果你是第一次安装,还没有设置过/etc/sudoers,请使用visudo进行设置,具体教程请baidu

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