私がやった
root@masi:~# visudo -x /etc/sudoers
root@masi:~# exit
logout
masi@masi:~$ sudo apt-get install vim
>>> /etc/sudoers: syntax error near line 1 <<<
{\n}ファイルが/etc/sudoers空です。
はい
root@masi:/home/masi# apt-get install --reinstall sudo
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 0 B/855 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 136923 files and directories currently installed.)
Preparing to unpack .../sudo_1.8.10p3-1+deb8u3_amd64.deb ...
Unpacking sudo (1.8.10p3-1+deb8u3) over (1.8.10p3-1+deb8u3) ...
Processing triggers for man-db (2.7.0.2-5) ...
Processing triggers for systemd (215-17+deb8u4) ...
Setting up sudo (1.8.10p3-1+deb8u3) ...
root@masi:/home/masi# exit
masi@masi:~$ sudo apt-get install vim
>>> /etc/sudoers: syntax error near line 1 <<<
...
答え1
解決策はadonis'によるルートです/etc/sudoers。gedit /etc/sudoers
#
# 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
# 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
完璧！