我的服务器上有 Debian Testing。升级时，它想升级 openssh-server 但失败了...
openssh-server (1:7.3p1-1) wird eingerichtet ...
Job for ssh.service failed because the control process exited with error code.
See "systemctl status ssh.service" and "journalctl -xe" for details.
invoke-rc.d: initscript ssh, action "start" failed.
● ssh.service - OpenBSD Secure Shell server
Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Mo 2016-08-22 11:40:09 CEST; 13ms ago
Process: 32634 ExecStart=/usr/sbin/sshd -D $SSHD_OPTS (code=exited, status=255)
Main PID: 32634 (code=exited, status=255)
Aug 22 11:40:09 elserver systemd[1]: Starting OpenBSD Secure Shell server...
Aug 22 11:40:09 elserver systemd[1]: ssh.service: Main process exited, code=exited, status=255/n/a
Aug 22 11:40:09 elserver systemd[1]: Failed to start OpenBSD Secure Shell server.
Aug 22 11:40:09 elserver systemd[1]: ssh.service: Unit entered failed state.
Aug 22 11:40:09 elserver systemd[1]: ssh.service: Failed with result 'exit-code'.
dpkg: Fehler beim Bearbeiten des Paketes openssh-server (--configure):
Unterprozess installiertes post-installation-Skript gab den Fehlerwert 1 zurück
Fehler traten auf beim Bearbeiten von:
openssh-server
E: Sub-process /usr/bin/dpkg returned an error code (1)
当我做systemctl status ssh.service或者journalctl-xe按照建议或服务 ssh 状态我收到了同样的消息。我现在害怕重启机器，因为我实际上是通过 ssh 连接的，现在担心重启后无法重新连接。
我还尝试重新安装 openssh-server，但什么也没改变。
有什么建议这里可能存在什么问题？
编辑 1 这是输出sshd -T：
port 22
protocol 2
addressfamily any
listenaddress [::]:22
listenaddress 0.0.0.0:22
usepam yes
serverkeybits 1024
logingracetime 120
keyregenerationinterval 3600
x11displayoffset 10
maxauthtries 6
maxsessions 10
clientaliveinterval 0
clientalivecountmax 3
streamlocalbindmask 0177
permitrootlogin without-password
ignorerhosts yes
ignoreuserknownhosts no
rhostsrsaauthentication no
hostbasedauthentication no
hostbasedusesnamefrompacketonly no
rsaauthentication yes
pubkeyauthentication yes
kerberosauthentication no
kerberosorlocalpasswd yes
kerberosticketcleanup yes
gssapiauthentication no
gssapikeyexchange no
gssapicleanupcredentials yes
gssapistrictacceptorcheck yes
gssapistorecredentialsonrekey no
passwordauthentication yes
kbdinteractiveauthentication no
challengeresponseauthentication no
printmotd no
printlastlog yes
x11forwarding yes
x11uselocalhost yes
permittty yes
permituserrc yes
strictmodes yes
tcpkeepalive yes
permitemptypasswords no
permituserenvironment no
uselogin no
compression delayed
gatewayports no
usedns no
allowtcpforwarding yes
allowagentforwarding yes
allowstreamlocalforwarding yes
streamlocalbindunlink no
useprivilegeseparation yes
fingerprinthash SHA256
pidfile /var/run/sshd.pid
xauthlocation /usr/bin/xauth
ciphers [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
macs [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
versionaddendum none
kexalgorithms [email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1
hostbasedacceptedkeytypes [email protected],[email protected],[email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
hostkeyalgorithms [email protected],[email protected],[email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
pubkeyacceptedkeytypes [email protected],[email protected],[email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
loglevel INFO
syslogfacility AUTH
authorizedkeysfile .ssh/authorized_keys .ssh/authorized_keys2
hostkey /etc/ssh/ssh_host_rsa_key
hostkey /etc/ssh/ssh_host_ecdsa_key
hostkey /etc/ssh/ssh_host_ed25519_key
acceptenv LANG
acceptenv LC_*
authenticationmethods any
subsystem sftp /usr/lib/openssh/sftp-server
maxstartups 10:30:100
permittunnel no
ipqos lowdelay throughput
rekeylimit 0 0
permitopen any