我的电脑昨天突然关机了，在这里搜索后，我发现我应该查看 /var/log/syslog。但我不知道该找什么，关机时发生了很多事情。我只想知道是否有外部参与者的恶意活动。我无法在此处发布整个日志，但这里摘录了最后几行相关内容（尽管关机可能发生在此之前，所以我不知道它是否相关。但是，即使我对这个日志一点也不熟悉，但那里面的一些东西看起来很奇怪）。如果有人可以推荐一个好的方法，我会在某处发布整个日志（整个日志的意思是，从我现在发布的内容前 10 秒开始，在 20:17:10 左右发生了很多事情）。
Mar 11 20:17:20 jonathan-Latitude-E7250 NetworkManager[788]: <info> [1520795840.6499] device (wlan0): Activation: successful, device activated.
Mar 11 20:17:20 jonathan-Latitude-E7250 NetworkManager[788]: <info> [1520795840.6532] manager: startup complete
Mar 11 20:17:20 jonathan-Latitude-E7250 nm-dispatcher: req:2 'up' [wlan0]: new request (1 scripts)
Mar 11 20:17:20 jonathan-Latitude-E7250 nm-dispatcher: req:2 'up' [wlan0]: start running ordered scripts...
Mar 11 20:17:20 jonathan-Latitude-E7250 NetworkManager[788]: <info> [1520795840.8693] dnsmasq[0x99f900]: dnsmasq appeared as :1.85
Mar 11 20:17:20 jonathan-Latitude-E7250 dnsmasq[1980]: setting upstream servers from DBus
Mar 11 20:17:20 jonathan-Latitude-E7250 dnsmasq[1980]: using nameserver 213.80.98.2#53(via wlan0)
Mar 11 20:17:20 jonathan-Latitude-E7250 dnsmasq[1980]: using nameserver 213.80.101.3#53(via wlan0)
Mar 11 20:17:20 jonathan-Latitude-E7250 systemd[1]: Started Network Manager Wait Online.
Mar 11 20:17:20 jonathan-Latitude-E7250 systemd[1]: Reached target Network is Online.
Mar 11 20:17:20 jonathan-Latitude-E7250 systemd[1]: Started Daily apt download activities.
Mar 11 20:17:20 jonathan-Latitude-E7250 systemd[1]: Started Daily apt upgrade and clean activities.
Mar 11 20:17:20 jonathan-Latitude-E7250 systemd[1]: Reached target Timers.
Mar 11 20:17:20 jonathan-Latitude-E7250 systemd[1]: Starting /etc/rc.local Compatibility...
Mar 11 20:17:21 jonathan-Latitude-E7250 systemd[1]: Started crash report submission daemon.
Mar 11 20:17:21 jonathan-Latitude-E7250 systemd[1]: Started /etc/rc.local Compatibility.
Mar 11 20:17:21 jonathan-Latitude-E7250 whoopsie[2058]: [20:17:21] Using lock path: /var/lock/whoopsie/lock
Mar 11 20:17:21 jonathan-Latitude-E7250 systemd[1]: Starting Hold until boot process finishes up...
Mar 11 20:17:21 jonathan-Latitude-E7250 systemd[1]: Started Hold until boot process finishes up.
Mar 11 20:17:21 jonathan-Latitude-E7250 systemd[1]: Starting Set console scheme...
Mar 11 20:17:21 jonathan-Latitude-E7250 systemd[1]: Started Getty on tty1.
Mar 11 20:17:21 jonathan-Latitude-E7250 systemd[1]: Reached target Login Prompts.
Mar 11 20:17:21 jonathan-Latitude-E7250 systemd[1]: Started Set console scheme.
Mar 11 20:17:21 jonathan-Latitude-E7250 whoopsie[2058]: [20:17:21] The default IPv4 route is: /org/freedesktop/NetworkManager/ActiveConnection/0
Mar 11 20:17:21 jonathan-Latitude-E7250 whoopsie[2058]: [20:17:21] Not a paid data plan: /org/freedesktop/NetworkManager/ActiveConnection/0
Mar 11 20:17:21 jonathan-Latitude-E7250 whoopsie[2058]: [20:17:21] Found usable connection: /org/freedesktop/NetworkManager/ActiveConnection/0
Mar 11 20:17:21 jonathan-Latitude-E7250 systemd[1]: Reloading OpenBSD Secure Shell server.
Mar 11 20:17:21 jonathan-Latitude-E7250 systemd[1]: Reloaded OpenBSD Secure Shell server.
Mar 11 20:17:21 jonathan-Latitude-E7250 NetworkManager[788]: <info> [1520795841.7391] manager: WiFi hardware radio set enabled
Mar 11 20:17:21 jonathan-Latitude-E7250 NetworkManager[788]: <info> [1520795841.7394] manager: WWAN hardware radio set enabled
Mar 11 20:17:22 jonathan-Latitude-E7250 systemd[1]: Started Daemon for generating UUIDs.
Mar 11 20:17:22 jonathan-Latitude-E7250 systemd[1]: Reloading OpenBSD Secure Shell server.
Mar 11 20:17:22 jonathan-Latitude-E7250 systemd[1]: Reloaded OpenBSD Secure Shell server.
Mar 11 20:16:34 jonathan-Latitude-E7250 systemd[1294]: Time has been changed
Mar 11 20:16:34 jonathan-Latitude-E7250 ntpdate[2090]: step time server 91.189.89.199 offset -53.780129 sec
Mar 11 20:16:34 jonathan-Latitude-E7250 systemd[1073]: Time has been changed
Mar 11 20:16:34 jonathan-Latitude-E7250 systemd[1]: Time has been changed
Mar 11 20:16:39 jonathan-Latitude-E7250 kernel: [ 25.807814] dell_wmi: Unknown WMI event type 0x12
Mar 11 20:16:40 jonathan-Latitude-E7250 bluetoothd[754]: Endpoint unregistered: sender=:1.44 path=/MediaEndpoint/A2DPSource
Mar 11 20:16:40 jonathan-Latitude-E7250 bluetoothd[754]: Endpoint unregistered: sender=:1.44 path=/MediaEndpoint/A2DPSink
Mar 11 20:16:44 jonathan-Latitude-E7250 org.gnome.zeitgeist.Engine[1439]: ** (zeitgeist-datahub:2344): WARNING **: zeitgeist-datahub.vala:229: Unable to get name "org.gnome.zeitgeist.datahub" on the bus!
Mar 11 20:16:47 jonathan-Latitude-E7250 systemd-timesyncd[609]: Synchronized to time server 91.189.89.199:123 (ntp.ubuntu.com).
Mar 11 20:17:27 jonathan-Latitude-E7250 gnome-session[1584]: pkexec must be setuid root
Mar 11 20:17:28 jonathan-Latitude-E7250 gnome-session[1584]: Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
Mar 11 20:17:47 jonathan-Latitude-E7250 systemd[1]: powerd.service: Start operation timed out. Terminating.
Mar 11 20:17:47 jonathan-Latitude-E7250 powerd[801]: SIGTERM recieved, cleaning up
Mar 11 20:18:18 jonathan-Latitude-E7250 systemd[1]: Stopping User Manager for UID 112...
Mar 11 20:18:18 jonathan-Latitude-E7250 systemd[1073]: Stopped target Default.
Mar 11 20:18:18 jonathan-Latitude-E7250 systemd[1073]: Stopped Run Click user-level hooks.
Mar 11 20:18:18 jonathan-Latitude-E7250 systemd[1073]: Stopped target Basic System.
Mar 11 20:18:18 jonathan-Latitude-E7250 systemd[1073]: Stopped target Paths.
Mar 11 20:18:18 jonathan-Latitude-E7250 systemd[1073]: Stopped target Timers.
Mar 11 20:18:18 jonathan-Latitude-E7250 systemd[1073]: Stopped target Sockets.
Mar 11 20:18:18 jonathan-Latitude-E7250 systemd[1073]: Reached target Shutdown.
Mar 11 20:18:18 jonathan-Latitude-E7250 systemd[1073]: Starting Exit the Session...
Mar 11 20:18:18 jonathan-Latitude-E7250 systemd[1073]: Received SIGRTMIN+24 from PID 2840 (kill).
Mar 11 20:18:18 jonathan-Latitude-E7250 systemd[1]: Stopped User Manager for UID 112.
Mar 11 20:18:18 jonathan-Latitude-E7250 systemd[1]: Removed slice User Slice of lightdm.
Mar 11 20:19:17 jonathan-Latitude-E7250 systemd[1]: powerd.service: State 'stop-final-sigterm' timed out. Killing.
Mar 11 20:19:17 jonathan-Latitude-E7250 systemd[1]: powerd.service: Main process exited, code=killed, status=9/KILL
Mar 11 20:19:17 jonathan-Latitude-E7250 systemd[1]: Failed to start monitor and control system power state.
Mar 11 20:19:17 jonathan-Latitude-E7250 systemd[1]: powerd.service: Unit entered failed state.
Mar 11 20:19:17 jonathan-Latitude-E7250 systemd[1]: powerd.service: Failed with result 'signal'.
Mar 11 20:19:17 jonathan-Latitude-E7250 systemd[1]: Reached target Multi-User System.
Mar 11 20:19:17 jonathan-Latitude-E7250 systemd[1]: Reached target Graphical Interface.
Mar 11 20:19:17 jonathan-Latitude-E7250 systemd[1]: Started Stop ureadahead data collection 45s after completed startup.
Mar 11 20:19:17 jonathan-Latitude-E7250 systemd[1]: Starting Update UTMP about System Runlevel Changes...
Mar 11 20:19:17 jonathan-Latitude-E7250 systemd[1]: Started Update UTMP about System Runlevel Changes.
Mar 11 20:19:17 jonathan-Latitude-E7250 systemd[1]: Startup finished in 1.784s (kernel) + 3min 1.701s (userspace) = 3min 3.486s.
Mar 11 20:20:02 jonathan-Latitude-E7250 systemd[1]: Starting Stop ureadahead data collection...
Mar 11 20:20:02 jonathan-Latitude-E7250 systemd[1]: Stopped Read required files in advance.
Mar 11 20:20:02 jonathan-Latitude-E7250 systemd[1]: Started Stop ureadahead data collection.
编辑：Ubuntu 16.04 LTS，戴尔 Latitude E7250