这是我第一次在这里发帖，所以请耐心等待。我目前正在尝试使用本指南在我的 ubuntu 20.04 服务器上设置 2fa：https://ubuntu.com/tutorials/configure-ssh-2fa#1-overview
但是，按照所有步骤操作后，我填写密码后从未提示我输入验证码，只是登录即可。但是，当我把它放在@include common-auth 前面时，它会先要求我输入验证码，然后再输入密码。
我目前不知道如何解决这个问题，所以如果有人知道解决方案或有任何有用的指点，我很乐意听到！
我的 /etc/pam.d/sshd 文件：
GNU nano 4.8 /etc/pam.d/sshd
# PAM configuration for the Secure Shell service
#auth required pam_google_authenticator.so
# Standard Un*x authentication.
@include common-auth
auth required pam_google_authenticator.so
# Disallow non-root logins when /etc/nologin exists.
account required pam_nologin.so
# Uncomment and edit /etc/security/access.conf if you need to set com>
# access limits that are hard to express in sshd_config.
# account required pam_access.so
# Standard Un*x authorization.
@include common-account
# SELinux needs to be the first session rule. This ensures that any
# lingering context has been cleared. Without this it is possible th>
# module could execute code in the wrong domain.
session [success=ok ignore=ignore module_unknown=ignore default=bad] >
# Set the loginuid process attribute.
session required pam_loginuid.so
# Create a new session keyring.
session optional pam_keyinit.so force revoke
# Standard Un*x session setup and teardown.
@include common-session
# Print the message of the day upon successful login.
# This includes a dynamically generated part from /run/motd.dynamic
# and a static (admin-editable) part from /etc/motd.
session optional pam_motd.so motd=/run/motd.dynamic
session optional pam_motd.so noupdate
# Print the status of the user's mailbox upon successful login.
session optional pam_mail.so standard noenv # [1]
# Set up user limits from /etc/security/limits.conf.
session required pam_limits.so
# Read environment variables from /etc/environment and
# /etc/security/pam_env.conf.
session required pam_env.so # [1]
# In Debian 4.0 (etch), locale-related environment variables were mov>
# /etc/default/locale, so read that as well.
session required pam_env.so user_readenv=1 envfile=/etc/defaul>
# SELinux needs to intervene at login time to ensure that the process># in the proper default security context. Only sessions which are in>
# to run in the user's context should be run after this.
session [success=ok ignore=ignore module_unknown=ignore default=bad] >
# Standard Un*x password updating.
@include common-password
我的 sshd 文件：
# $OpenBSD: sshd_config,v 1.103 2018/04/09 20:41:22 tj Exp $
# This is the sshd server system-wide configuration file. See
# sshd_config(5) for more information.
# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin
# The strategy used for options in the default sshd_config shipped wi>
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options override t>
# default value.
Include /etc/ssh/sshd_config.d/*.conf
Port 18222
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
#HostKey /etc/ssh/ssh_host_ed25519_key
# Ciphers and keying
#RekeyLimit default none
# Logging
#SyslogFacility AUTH
LogLevel VERBOSE
# Authentication:
#LoginGraceTime 2m
PermitRootLogin no
#StrictModes yes
MaxAuthTries 3
MaxSessions 2
#PubkeyAuthentication yes
# Expect .ssh/authorized_keys2 to be disregarded by default in future.
#AuthorizedKeysFile .ssh/authorized_keys .ssh/authorized_keys2
#AuthorizedPrincipalsFile none
#AuthorizedKeysCommand none
#AuthorizedKeysCommandUser nobody
# For this to work you will also need host keys in /etc/ssh/ssh_known>
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes
# To disable tunneled clear text passwords, change to no here!
#PasswordAuthentication yes
#PermitEmptyPasswords no
# Change to yes to enable challenge-response passwords (beware issues>
# some PAM modules and threads)
ChallengeResponseAuthentication yes
# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no
# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
#GSSAPIStrictAcceptorCheck yes
#GSSAPIKeyExchange no
# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication. Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes
AllowAgentForwarding no
AllowTcpForwarding no
#GatewayPorts no
X11Forwarding no
#X11DisplayOffset 10
#X11UseLocalhost yes
#PermitTTY yes
PrintMotd no
#PrintLastLog yes
TCPKeepAlive no
PermitUserEnvironment no
#Compression delayed
ClientAliveInterval 0
ClientAliveCountMax 2
#UseDNS no
#PidFile /var/run/sshd.pid
#MaxStartups 10:30:100
PermitTunnel no
#ChrootDirectory none
#VersionAddendum none
# no default banner path
Banner /etc/issue.net
# Allow client to pass locale environment variables
AcceptEnv LANG LC_*
# override default of no subsystems
# Example of overriding settings on a per-user basis
#Match User anoncvs
# X11Forwarding no
# AllowTcpForwarding no
# PermitTTY no
# ForceCommand cvs server
#Match group sftp
#ChrootDirectory /home
#X11Forwarding no
#AllowTcpForwarding no
#ForceCommand internal-sftp