看了一篇文“ubuntu sudo不用输入密码的方法”,修改了/etc/sudoers文件,再试使用sudo时悲剧了,提示:
sudo: no valid sudoers sources found, quitting
查了资料说要恢复到Recovery mode用root用户还原之前做的修改,但是重启按了shift或f12都没反应,最后用
$ su root
输入root密码搞定,root密码同建立账户时第一次输入的密码。附/etc/sudoers源文件内容
# # This file MUST be edited with the 'visudo' command as root. # # Please consider adding local content in /etc/sudoers.d/ instead of # directly modifying this file. # # See the man page for details on how to write a sudoers file. # Defaults env_reset Defaults mail_badpass Defaults secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" # Host alias specification # User alias specification # Cmnd alias specification # User privilege specification root ALL=(ALL:ALL) ALL # Members of the admin group may gain root privileges %admin ALL=(ALL) ALL # Allow members of group sudo to execute any command %sudo ALL=(ALL:ALL) ALL # See sudoers(5) for more information on "#include" directives: #includedir /etc/sudoers.d