ubuntu gui root 로그인 허용

1. /etc/gdm3/custom.conf 내용 수정

• AllowRoot=true 추가

# GDM configuration storage
#
# See /usr/share/gdm/gdm.schemas for a list of available options.

[daemon]
# Uncomment the line below to force the login screen to use Xorg
#WaylandEnable=false

# Enabling automatic login
#  AutomaticLoginEnable = true
#  AutomaticLogin = user1

# Enabling timed login
#  TimedLoginEnable = true
#  TimedLogin = user1
#  TimedLoginDelay = 10
AllowRoot=true

[security]

[xdmcp]

[chooser]

[debug]
# Uncomment the line below to turn on debugging
# More verbose logs
# Additionally lets the X server dump core if it crashes
#Enable=true

2. /etc/pam.d/gdm관련 파일 수정

• /etc/pam.d/gdm-password

## auth required pam_succeed_if.so user != root quiet_success 부분 주석

#%PAM-1.0
auth    requisite       pam_nologin.so
#auth   required        pam_succeed_if.so user != root quiet_success
@include common-auth
auth    optional        pam_gnome_keyring.so
@include common-account
...

• /etc/pam.d/gdm-autologin

## auth required pam_succeed_if.so user != root quiet_success 부분 주석

#%PAM-1.0
auth    requisite       pam_nologin.so
#auth   required        pam_succeed_if.so user != root quiet_success
auth    optional        pam_gdm.so
auth    optional        pam_gnome_keyring.so
auth    required        pam_permit.so

3. 모두 설정 후 재부팅 확인 (user 로그인이 아닌 root로 로그인)