我不知道如何解决这个问题，因为使用 systemd 的 15.04 和 15.10 都只能让我进入紧急 shell，而 upstart 却可以正常工作。我为这个问题苦苦挣扎了整个版本，如果能得到帮助我将不胜感激。
这是我的 dmesg 的最后几行：
[ 100.633980] systemd[1]: Accepted new private connection.
[ 100.634001] systemd-cgroups-agent[792]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1/agent interface=org.freedesktop.systemd1.Agent member=Released cookie=1 reply_cookie=0 error=n/a
[ 100.634005] systemd[1]: Got disconnect on private connection.
[ 100.634180] systemd[1]: Got message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1/agent interface=org.freedesktop.systemd1.Agent member=Released cookie=1 reply_cookie=0 error=n/a
[ 100.634269] systemd[1]: Got disconnect on private connection.
[ 100.636283] systemd[1]: Received SIGCHLD from PID 751 (resolvconf).
[ 100.636293] systemd[1]: Child 751 (resolvconf) died (code=exited, status=0/SUCCESS)
[ 100.636307] systemd[1]: resolvconf.service: Child 751 belongs to resolvconf.service
[ 100.636312] systemd[1]: resolvconf.service: Main process exited, code=exited, status=0/SUCCESS
[ 100.636382] systemd[1]: resolvconf.service: Changed running -> exited
[ 100.636386] systemd[1]: resolvconf.service: cgroup is empty
[ 100.637035] systemd[1]: Accepted new private connection.
[ 100.637071] systemd-cgroups-agent[808]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1/agent interface=org.freedesktop.systemd1.Agent member=Released cookie=1 reply_cookie=0 error=n/a
[ 100.637077] systemd[1]: Got message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1/agent interface=org.freedesktop.systemd1.Agent member=Released cookie=1 reply_cookie=0 error=n/a
[ 100.637156] systemd[1]: Got disconnect on private connection.
[ 100.643279] audit: type=1400 audit(1452853904.083:2): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/lightdm/lightdm-guest-session" pid=822 comm="apparmor_parser"
[ 100.643283] audit: type=1400 audit(1452853904.083:3): apparmor="STATUS" operation="profile_load" profile="unconfined" name="chromium" pid=822 comm="apparmor_parser"
[ 100.644807] audit: type=1400 audit(1452853904.083:4): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/sbin/dhclient" pid=822 comm="apparmor_parser"
[ 100.644811] audit: type=1400 audit(1452853904.083:5): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=822 comm="apparmor_parser"
[ 100.644814] audit: type=1400 audit(1452853904.083:6): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-helper" pid=822 comm="apparmor_parser"
[ 100.644817] audit: type=1400 audit(1452853904.083:7): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/connman/scripts/dhclient-script" pid=822 comm="apparmor_parser"
[ 100.651499] audit: type=1400 audit(1452853904.091:8): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/bin/evince" pid=822 comm="apparmor_parser"
[ 100.651503] audit: type=1400 audit(1452853904.091:9): apparmor="STATUS" operation="profile_load" profile="unconfined" name="sanitized_helper" pid=822 comm="apparmor_parser"
[ 100.651506] audit: type=1400 audit(1452853904.091:10): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/bin/evince-previewer" pid=822 comm="apparmor_parser"
[ 100.651508] audit: type=1400 audit(1452853904.091:11): apparmor="STATUS" operation="profile_load" profile="unconfined" name="sanitized_helper" pid=822 comm="apparmor_parser"
[ 100.651700] systemd-journald[471]: Failed to forward syslog message: Connection refused
[ 100.658209] systemd-journald[471]: Failed to forward syslog message: Connection refused
[ 100.660713] systemd-journald[471]: Failed to forward syslog message: Connection refused
[ 100.660786] systemd[1]: Received SIGCHLD from PID 737 (apparmor).
[ 100.660797] systemd[1]: Child 737 (apparmor) died (code=exited, status=0/SUCCESS)
[ 100.660814] systemd[1]: apparmor.service: Child 737 belongs to apparmor.service
[ 100.660821] systemd[1]: apparmor.service: Control process exited, code=exited status=0
[ 100.660836] systemd[1]: apparmor.service: Got final SIGCHLD for state start.
[ 100.660951] systemd[1]: apparmor.service: Changed start -> exited
[ 100.660955] systemd[1]: apparmor.service: Job apparmor.service/start finished, result=done
[ 100.660960] systemd[1]: Started LSB: AppArmor initialization.
[ 100.661034] systemd[1]: apparmor.service: cgroup is empty
[ 100.661228] systemd[1]: networking.service: About to execute: /etc/init.d/networking start
[ 100.661324] systemd[1]: networking.service: Forked /etc/init.d/networking as 828
[ 100.661366] systemd[1]: networking.service: Changed dead -> start
[ 100.661372] systemd[1]: Starting LSB: Raise network interfaces....
[ 100.661701] systemd[828]: networking.service: Executing: /etc/init.d/networking start
[ 100.662192] systemd[1]: Accepted new private connection.
[ 100.662252] systemd-cgroups-agent[827]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1/agent interface=org.freedesktop.systemd1.Agent member=Released cookie=1 reply_cookie=0 error=n/a
[ 100.662323] systemd[1]: Got message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1/agent interface=org.freedesktop.systemd1.Agent member=Released cookie=1 reply_cookie=0 error=n/a
[ 100.662360] systemd[1]: apparmor.service: cgroup is empty
[ 100.662382] systemd[1]: Got disconnect on private connection.
[ 100.665820] systemd-journald[471]: Failed to forward syslog message: Connection refused
[ 100.691237] systemd-journald[471]: Failed to forward syslog message: Connection refused
[ 100.691276] systemd[1]: Received SIGCHLD from PID 828 (networking).
[ 100.691288] systemd[1]: Child 828 (networking) died (code=exited, status=0/SUCCESS)
[ 100.691305] systemd[1]: networking.service: Child 828 belongs to networking.service
[ 100.691309] systemd[1]: networking.service: Control process exited, code=exited status=0
[ 100.691322] systemd[1]: networking.service: Got final SIGCHLD for state start.
[ 100.691338] systemd[1]: networking.service: Changed start -> running
[ 100.691342] systemd[1]: networking.service: Job networking.service/start finished, result=done
[ 100.691349] systemd[1]: Started LSB: Raise network interfaces..
[ 100.691528] systemd[1]: network.target changed dead -> active
[ 100.691531] systemd[1]: network.target: Job network.target/start finished, result=done
[ 100.691535] systemd[1]: Reached target Network.
[ 100.691548] systemd[1]: network-online.target changed dead -> active
[ 100.691550] systemd[1]: network-online.target: Job network-online.target/start finished, result=done
[ 100.691553] systemd[1]: Reached target Network is Online.
[ 100.691573] systemd[1]: Assertion 'r >= 0' failed at ../src/libsystemd/sd-event/sd-event.c:484, function source_io_unregister(). Ignoring.
[ 100.691580] systemd[1]: Startup finished in 10.490s (kernel) + 1min 30.231s (userspace) = 4min 57.942s.
[ 100.694597] systemctl[922]: Showing one /org/freedesktop/systemd1/unit/ntp_2eservice
[ 100.695050] systemd[1]: Accepted new private connection.
[ 100.695102] systemctl[922]: Sent message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/ntp_2eservice interface=org.freedesktop.DBus.Properties member=GetAll cookie=1 reply_cookie=0 error=n/a
[ 100.695144] systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/ntp_2eservice interface=org.freedesktop.DBus.Properties member=GetAll cookie=1 reply_cookie=0 error=n/a
[ 100.695182] systemd[1]: ntp.service: Failed to load configuration: No such file or directory
[ 100.695350] systemd[1]: Sent message type=method_return sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 error=n/a
[ 100.695363] systemd[1]: ntp.service: Collecting.
[ 100.695370] systemd[1]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=UnitNew cookie=2 reply_cookie=0 error=n/a
[ 100.695374] systemd[1]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=UnitRemoved cookie=3 reply_cookie=0 error=n/a
[ 100.695379] systemctl[922]: Got message type=method_return sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 error=n/a
[ 100.695557] systemd[1]: Got disconnect on private connection.
[ 100.696711] systemd[740]: emergency.service: Executing: /bin/plymouth --wait quit
[ 100.696807] systemd[1]: Accepted new private connection.
[ 100.696854] systemctl[923]: Sent message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1 interface=org.freedesktop.DBus.Properties member=Get cookie=1 reply_cookie=0 error=n/a
[ 100.696894] systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1 interface=org.freedesktop.DBus.Properties member=Get cookie=1 reply_cookie=0 error=n/a
[ 100.696906] systemd[1]: Sent message type=method_return sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 error=n/a
[ 100.696942] systemctl[923]: Got message type=method_return sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 error=n/a
[ 100.696982] systemd[1]: Got disconnect on private connection.
[ 100.697687] systemctl[924]: Calling manager for StopUnit on ntp.service, ignore-dependencies
[ 100.698157] systemd[1]: Accepted new private connection.
[ 100.698217] systemctl[924]: Sent message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=StopUnit cookie=1 reply_cookie=0 error=n/a
[ 100.698268] systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=StopUnit cookie=1 reply_cookie=0 error=n/a
[ 100.698290] systemd[1]: ntp.service: Failed to load configuration: No such file or directory
[ 100.698302] systemd[1]: Sent message type=error sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 error=Unit ntp.service not loaded.
[ 100.698305] systemd[1]: Failed to process message [type=method_call sender=n/a path=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=StopUnit signature=ss]: Unit ntp.service not loaded.
[ 100.698307] systemd[1]: ntp.service: Collecting.
[ 100.698313] systemd[1]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=UnitNew cookie=2 reply_cookie=0 error=n/a
[ 100.698317] systemd[1]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=UnitRemoved cookie=3 reply_cookie=0 error=n/a
[ 100.698318] systemctl[924]: Got message type=error sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 error=Unit ntp.service not loaded.
[ 100.698322] systemctl[924]: Failed to stop ntp.service: Unit ntp.service not loaded.
[ 100.698348] systemctl[924]: Sent message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/ntp_2eservice interface=org.freedesktop.DBus.Properties member=Get cookie=2 reply_cookie=0 error=n/a
[ 100.698371] systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/ntp_2eservice interface=org.freedesktop.DBus.Properties member=Get cookie=2 reply_cookie=0 error=n/a
[ 100.698392] systemd[1]: ntp.service: Failed to load configuration: No such file or directory
[ 100.698404] systemd[1]: Sent message type=method_return sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=4 reply_cookie=2 error=n/a
[ 100.698407] systemd[1]: ntp.service: Collecting.
[ 100.698413] systemd[1]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=UnitNew cookie=5 reply_cookie=0 error=n/a
[ 100.698417] systemctl[924]: Got message type=method_return sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=4 reply_cookie=2 error=n/a
[ 100.698418] systemd[1]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=UnitRemoved cookie=6 reply_cookie=0 error=n/a
[ 100.698427] systemctl[924]: Sent message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/ntp_2eservice interface=org.freedesktop.DBus.Properties member=Get cookie=3 reply_cookie=0 error=n/a
[ 100.698432] systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/ntp_2eservice interface=org.freedesktop.DBus.Properties member=Get cookie=3 reply_cookie=0 error=n/a
[ 100.698446] systemd[1]: ntp.service: Failed to load configuration: No such file or directory
[ 100.698454] systemd[1]: Sent message type=method_return sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=7 reply_cookie=3 error=n/a
[ 100.698457] systemd[1]: ntp.service: Collecting.
[ 100.698461] systemd[1]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=UnitNew cookie=8 reply_cookie=0 error=n/a
[ 100.698466] systemd[1]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=UnitRemoved cookie=9 reply_cookie=0 error=n/a
[ 100.698468] systemctl[924]: Got message type=method_return sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=7 reply_cookie=3 error=n/a
[ 100.698518] systemd[1]: Got disconnect on private connection.
[ 100.699756] systemd-journald[471]: Failed to forward syslog message: Connection refused
[ 100.705302] systemctl[945]: Showing one /org/freedesktop/systemd1/unit/ntp_2eservice
[ 100.705807] systemd[1]: Accepted new private connection.
[ 100.705865] systemctl[945]: Sent message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/ntp_2eservice interface=org.freedesktop.DBus.Properties member=GetAll cookie=1 reply_cookie=0 error=n/a
[ 100.705891] systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/ntp_2eservice interface=org.freedesktop.DBus.Properties member=GetAll cookie=1 reply_cookie=0 error=n/a
[ 100.705917] systemd[1]: ntp.service: Failed to load configuration: No such file or directory
[ 100.706081] systemd[1]: Sent message type=method_return sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 error=n/a
[ 100.706085] systemd[1]: ntp.service: Collecting.
[ 100.706091] systemd[1]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=UnitNew cookie=2 reply_cookie=0 error=n/a
[ 100.706096] systemd[1]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=UnitRemoved cookie=3 reply_cookie=0 error=n/a
[ 100.706097] systemctl[945]: Got message type=method_return sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 error=n/a
[ 100.706272] systemd[1]: Got disconnect on private connection.
[ 100.707508] systemd[1]: Accepted new private connection.
[ 100.707532] systemctl[946]: Sent message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1 interface=org.freedesktop.DBus.Properties member=Get cookie=1 reply_cookie=0 error=n/a
[ 100.707543] systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1 interface=org.freedesktop.DBus.Properties member=Get cookie=1 reply_cookie=0 error=n/a
[ 100.707555] systemd[1]: Sent message type=method_return sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 error=n/a
[ 100.707565] systemctl[946]: Got message type=method_return sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 error=n/a
[ 100.707597] systemd[1]: Got disconnect on private connection.
[ 100.708251] systemctl[947]: Looking for unit files in (higher priority first):
[ 100.708253] systemctl[947]: /etc/systemd/system
[ 100.708254] systemctl[947]: /run/systemd/system
[ 100.708255] systemctl[947]: /usr/local/lib/systemd/system
[ 100.708256] systemctl[947]: /lib/systemd/system
[ 100.708257] systemctl[947]: /usr/lib/systemd/system
[ 100.708261] systemctl[947]: Looking for SysV init scripts in:
[ 100.708262] systemctl[947]: /etc/init.d
[ 100.708263] systemctl[947]: Looking for SysV rcN.d links in:
[ 100.708264] systemctl[947]: /etc
[ 100.708679] systemd[1]: Accepted new private connection.
[ 100.708708] systemctl[947]: Sent message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=GetUnitFileState cookie=1 reply_cookie=0 error=n/a
[ 100.708716] systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=GetUnitFileState cookie=1 reply_cookie=0 error=n/a
[ 100.708734] systemd[1]: Looking for unit files in (higher priority first):
[ 100.708736] systemd[1]: /etc/systemd/system
[ 100.708737] systemd[1]: /run/systemd/system
[ 100.708737] systemd[1]: /usr/local/lib/systemd/system
[ 100.708738] systemd[1]: /lib/systemd/system
[ 100.708739] systemd[1]: /usr/lib/systemd/system
[ 100.708742] systemd[1]: Looking for SysV init scripts in:
[ 100.708743] systemd[1]: /etc/init.d
[ 100.708745] systemd[1]: Looking for SysV rcN.d links in:
[ 100.708745] systemd[1]: /etc
[ 100.708758] systemd[1]: Sent message type=error sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 error=No such file or directory
[ 100.708761] systemd[1]: Failed to process message [type=method_call sender=n/a path=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=GetUnitFileState signature=s]: No such file or directory
[ 100.708775] systemctl[947]: Got message type=error sender=n/a destination=n/a object=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 error=No such file or directory
[ 100.708780] systemctl[947]: Failed to get unit file state for ntp.service: No such file or directory
[ 100.708798] systemd[1]: Got disconnect on private connection.
[ 100.709062] systemd[1]: Received SIGRTMIN+21 from PID 256 (plymouthd).
[ 100.709064] systemd[1]: Disabling showing of status.
[ 100.709281] systemd[1]: Received SIGCHLD from PID 894 (lockfile-touch).
[ 100.709292] systemd[1]: Child 890 (lockfile-remove) died (code=exited, status=0/SUCCESS)
[ 100.709309] systemd[1]: networking.service: Child 890 belongs to networking.service
[ 100.709356] systemd[1]: Child 894 (lockfile-touch) died (code=exited, status=0/SUCCESS)
[ 100.709368] systemd[1]: networking.service: Child 894 belongs to networking.service
[ 100.709381] systemd[1]: networking.service: cgroup is empty
[ 100.709434] systemd[1]: networking.service: Changed running -> exited
[ 100.710095] systemd[1]: Accepted new private connection.
[ 100.710157] systemd-cgroups-agent[948]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1/agent interface=org.freedesktop.systemd1.Agent member=Released cookie=1 reply_cookie=0 error=n/a
[ 100.710171] systemd[1]: Got message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1/agent interface=org.freedesktop.systemd1.Agent member=Released cookie=1 reply_cookie=0 error=n/a
[ 100.710261] systemd[1]: Got disconnect on private connection.
[ 100.733791] systemd[1]: Received SIGCHLD from PID 740 (plymouth).
[ 100.733811] systemd[1]: Child 740 (plymouth) died (code=exited, status=0/SUCCESS)
[ 100.733838] systemd[1]: emergency.service: Child 740 belongs to emergency.service
[ 100.733843] systemd[1]: emergency.service: Control process exited, code=exited status=0
[ 100.733924] systemd[1]: emergency.service: Running next control command for state start-pre.
[ 100.733965] systemd[1]: emergency.service: About to execute: /bin/echo -e 'Welcome to emergency mode! After logging in, type "journalctl -xb" to view\nsystem logs, "systemctl reboot" to reboot, "systemctl default" or ^D to\ntry again to boot into default mode.'
[ 100.734057] systemd[1]: emergency.service: Forked /bin/echo as 950
[ 100.734440] systemd[950]: emergency.service: Executing: /bin/echo -e 'Welcome to emergency mode! After logging in, type "journalctl -xb" to view\nsystem logs, "systemctl reboot" to reboot, "systemctl default" or ^D to\ntry again to boot into default mode.'
[ 100.734848] systemd[1]: Accepted new private connection.
[ 100.734893] systemd[1]: Received SIGCHLD from PID 950 (echo).
[ 100.734901] systemd[1]: Child 950 (echo) died (code=exited, status=0/SUCCESS)
[ 100.734913] systemd[1]: emergency.service: Child 950 belongs to emergency.service
[ 100.734915] systemd[1]: emergency.service: Control process exited, code=exited status=0
[ 100.734934] systemd[1]: emergency.service: Got final SIGCHLD for state start-pre.
[ 100.734952] systemd[1]: emergency.service: About to execute: /bin/sh -c '/sbin/sulogin; /bin/systemctl --job-mode=fail --no-block default'
[ 100.735012] systemd[1]: emergency.service: Forked /bin/sh as 952
[ 100.735065] systemd[1]: emergency.service: Changed start-pre -> running
[ 100.735182] systemd-cgroups-agent[949]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1/agent interface=org.freedesktop.systemd1.Agent member=Released cookie=1 reply_cookie=0 error=n/a
[ 100.735307] systemd[952]: emergency.service: Executing: /bin/sh -c '/sbin/sulogin; /bin/systemctl --job-mode=fail --no-block default'
[ 100.735694] systemd[1]: Accepted new private connection.
[ 100.735734] systemd[1]: Got disconnect on private connection.
[ 100.735734] systemd-cgroups-agent[951]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1/agent interface=org.freedesktop.systemd1.Agent member=Released cookie=1 reply_cookie=0 error=n/a
[ 100.735933] systemd[1]: Got message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1/agent interface=org.freedesktop.systemd1.Agent member=Released cookie=1 reply_cookie=0 error=n/a
[ 100.735973] systemd[1]: Received SIGCHLD from PID 256 (plymouthd).
[ 100.735990] systemd[1]: Child 256 (plymouthd) died (code=exited, status=0/SUCCESS)
[ 100.736018] systemd[1]: Got disconnect on private connection.
[ 100.736998] systemd[1]: Accepted new private connection.
[ 100.737018] systemd-cgroups-agent[954]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1/agent interface=org.freedesktop.systemd1.Agent member=Released cookie=1 reply_cookie=0 error=n/a
[ 100.737027] systemd[1]: Got message type=signal sender=n/a destination=n/a object=/org/freedesktop/systemd1/agent interface=org.freedesktop.systemd1.Agent member=Released cookie=1 reply_cookie=0 error=n/a
[ 100.737079] systemd[1]: Got disconnect on private connection.
[ 103.609741] systemd[1]: systemd-udevd.service: Got notification message from PID 487 (WATCHDOG=1)
答案1
好的，这很愚蠢，但我发现解决方案错误与 USB 驱动器的 /etc/fstab 条目有关：
/dev/disk/by-label/SeqData1 /mnt/SeqData1 nosuid,nodev,nobootwait,nofail,noauto,x-gvfs-show 0 0
我必须注释掉这个，然后 systemd 才能正常启动。我不知道为什么 USB 驱动器的这个条目会在那里。我首先尝试使用 nofail 和 nopootwait，但没有帮助。仍然对这一切感到困惑，但问题已经解决了。