Ubuntu 莫名死机，求大神指点

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系统日志也看不出来，我截取了一段系统日志大家看看:

Apr 18 07:22:54 ubuntu goa[2039]: goa-daemon version 3.4.0 starting [main.c:112, main()]Apr 18 07:22:58 ubuntu bluetoothd[883]: Endpoint unregistered: sender=:1.32 path=/MediaEndpoint/HFPAGApr 18 07:22:58 ubuntu bluetoothd[883]: Endpoint unregistered: sender=:1.32 path=/MediaEndpoint/A2DPSourceApr 18 07:22:58 ubuntu bluetoothd[883]: Endpoint unregistered: sender=:1.32 path=/MediaEndpoint/A2DPSinkApr 18 07:23:40 ubuntu dbus[861]: [system] Activating service name='org.freedesktop.PackageKit' (using servicehelper)Apr 18 07:23:42 ubuntu AptDaemon: INFO: Initializing daemonApr 18 07:23:42 ubuntu AptDaemon.PackageKit: INFO: Initializing PackageKit compat layerApr 18 07:23:42 ubuntu dbus[861]: [system] Successfully activated service 'org.freedesktop.PackageKit'Apr 18 07:23:42 ubuntu AptDaemon.PackageKit: INFO: Initializing PackageKit transactionApr 18 07:23:42 ubuntu AptDaemon.Worker: INFO: Simulating trans: /org/debian/apt/transaction/793d8ab7342f4de9be71efe757fda410Apr 18 07:23:42 ubuntu AptDaemon.Worker: INFO: Processing transaction /org/debian/apt/transaction/793d8ab7342f4de9be71efe757fda410Apr 18 07:23:46 ubuntu AptDaemon.PackageKit: INFO: Get updates()Apr 18 07:23:47 ubuntu AptDaemon.Worker: INFO: Finished transaction /org/debian/apt/transaction/793d8ab7342f4de9be71efe757fda410Apr 18 07:25:53 ubuntu wpa_supplicant[966]: WPA: Group rekeying completed with 00:b0:0c:01:a3:7a [GTK=CCMP]Apr 18 07:31:45 ubuntu kernel: imklog 5.8.6, log source = /proc/kmsg started.Apr 18 07:31:45 ubuntu rsyslogd: [origin software="rsyslogd" swVersion="5.8.6" x-pid="867" x-info="http://www.rsyslog.com"] startApr 18 07:31:45 ubuntu rsyslogd: rsyslogd's groupid changed to 103Apr 18 07:31:45 ubuntu rsyslogd: rsyslogd's userid changed to 101

我拍照片的时间是7:30:31，可以看到，日志上在这之前的最后一条是7：25：53，之后是7：31：45，前后未发现错误日志