我查看了其他类似的问题，询问如何修复通用的“Ubuntu xx.xx 随机冻结”，但无法最终找到这个确切问题的答案：Ubuntu 15.04 似乎随机冻结。
我不知道具体发生了什么，但看起来 Ubuntu 仍在接收输入（至少来自键盘）：在第二个 syslog 粘贴的末尾（参见 pastebin 链接），您可以看到我尝试了Alt+ PrtScn+ ，但不知什么原因失败了。尝试通过+ +REISUB切换到控制台没有任何效果。CtrlAltF1
系统日志似乎每次都显示不同的原因。请参阅下面的系统统计信息和来自 syslog 的两个崩溃日志。
如果我可以提供任何其他信息来帮助解决问题，我会尽力尽快添加。感谢您的帮助——这个问题尤其令人沮丧，因为我正试图从这台机器运行 Web 服务器。
电脑规格
-Computer-
Model: Dell XPS 8700
Processor : 8x Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz
Memory : 7994MB (1226MB used)
Operating System : Ubuntu 15.04
-Display-
Resolution : 1920x1080 pixels
OpenGL Renderer : Unknown
X11 Vendor : The X.Org Foundation
-Multimedia-
Audio Adapter : HDA-Intel - HDA Intel PCH
Audio Adapter : HDA-Intel - HDA NVidia
-Input Devices-
DELL Dell USB Wired Multimedia Keyboard
DELL Dell USB Wired Multimedia Keyboard
DELL DELL USB Laser Mouse
HDA NVidia HDMI/DP,pcm : 3=
HDA NVidia HDMI/DP,pcm : 7=
-SCSI Disks-
ATA ST1000DM003-1CH1
HL-DT-ST DVD+-RW GHB0N
Generic- Compact Flash
Generic- SM/xD-Picture
Generic- SD/MMC
Generic- M.S./M.S.Pro/HG
-Version-
Kernel : Linux 3.19.0-26-generic (x86_64)
Compiled : #28-Ubuntu SMP Tue Aug 11 14:16:32 UTC 2015
C Library : Unknown
Default C Compiler : GNU C Compiler version 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
Distribution : Ubuntu 15.04显卡/驱动程序
*-display
description: VGA compatible controller
product: GK208 [GeForce GT 720]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nouveau latency=0
resources: irq:34 memory:f6000000-f6ffffff memory:e8000000-efffffff memory:f0000000-f1ffffff ioport:e000(size=128) memory:f7000000-f707ffff系统日志
20:52:04 kernel: [ 1060.804063] ------------[ cut here ]------------
20:52:04 kernel: [ 1060.804068] WARNING: CPU: 0 PID: 0 at /build/linux-SKpZC9/linux-3.19.0/kernel/watchdog.c:290 watchdog_overflow_callback+0x92/0xc0()
20:52:04 kernel: [ 1060.804069] Watchdog detected hard LOCKUP on cpu 0
20:52:04 kernel: [ 1060.804070] Modules linked in: ctr ccm rfcomm bnep nls_iso8859_1 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec arc4 snd_hwdep nouveau ath9k ath9k_common ath9k_hw snd_pcm intel_rapl iosf_mbi mxm_wmi snd_seq_midi x86_pkg_temp_thermal snd_seq_midi_event intel_powerclamp snd_rawmidi ath3k wmi btusb coretemp ath mac80211 kvm_intel kvm cfg80211 ttm drm_kms_helper bluetooth drm snd_seq dcdbas i2c_algo_bit mei_me snd_seq_device snd_timer crct10dif_pclmul crc32_pclmul ghash_clmulni_intel mei aesni_intel snd video shpchp aes_x86_64 lrw gf128mul soundcore mac_hid lpc_ich glue_helper serio_raw ablk_helper cryptd parport_pc ppdev lp parport autofs4 uas usb_storage hid_generic usbhid hid psmouse ahci r8169 libahci mii
20:52:04 kernel: [ 1060.804096] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.19.0-26-generic #28-Ubuntu
20:52:04 kernel: [ 1060.804096] Hardware name: Dell Inc. XPS 8700/0KWVT8, BIOS A07 03/13/2014
20:52:04 kernel: [ 1060.804097] ffffffff81a9ed48 ffff88021ec05ab0 ffffffff817c45cf 0000000000000007
20:52:04 kernel: [ 1060.804098] ffff88021ec05b00 ffff88021ec05af0 ffffffff81076a6a 0000000000000000
20:52:04 kernel: [ 1060.804100] ffff880216014800 0000000000000000 ffff88021ec05c40 ffff88021ec05ef8
20:52:04 kernel: [ 1060.804101] Call Trace:
20:52:04 kernel: [ 1060.804102] [] dump_stack+0x45/0x57
20:52:04 kernel: [ 1060.804107] [] warn_slowpath_common+0x8a/0xc0
20:52:04 kernel: [ 1060.804108] [] warn_slowpath_fmt+0x46/0x50
20:52:04 kernel: [ 1060.804110] [] watchdog_overflow_callback+0x92/0xc0
20:52:04 kernel: [ 1060.804112] [] __perf_event_overflow+0x8c/0x220
20:52:04 kernel: [ 1060.804115] [] ? x86_perf_event_set_period+0xca/0x170
20:52:04 kernel: [ 1060.804116] [] perf_event_overflow+0x14/0x20
20:52:04 kernel: [ 1060.804118] [] intel_pmu_handle_irq+0x1ba/0x3a0
20:52:04 kernel: [ 1060.804120] [] perf_event_nmi_handler+0x2b/0x50
20:52:04 kernel: [ 1060.804121] [] nmi_handle+0x80/0x120
20:52:04 kernel: [ 1060.804123] [] default_do_nmi+0x4a/0x140
20:52:04 kernel: [ 1060.804124] [] do_nmi+0xf8/0x170
20:52:04 kernel: [ 106Operating System
----------------
0.804126] [] end_repeat_nmi+0x1a/0x1e
20:52:04 kernel: [ 1060.804127] [] ? _raw_spin_lock_irqsave+0x4f/0x90
20:52:04 kernel: [ 1060.804128] [] ? _raw_spin_lock_irqsave+0x4f/0x90
20:52:04 kernel: [ 1060.804129] [] ? _raw_spin_lock_irqsave+0x4f/0x90
20:52:04 kernel: [ 1060.804129] > [] nouveau_fantog_update+0x94/0x180 [nouveau]
20:52:04 kernel: [ 1060.804154] [] nouveau_fantog_set+0x35/0x40 [nouveau]
20:52:04 kernel: [ 1060.804162] [] nouveau_fan_update+0x101/0x220 [nouveau]
20:52:04 kernel: [ 1060.804170] [] nouveau_therm_fan_set+0x19/0x20 [nouveau]
20:52:04 kernel: [ 1060.804177] [] nouveau_therm_update+0xbd/0x340 [nouveau]
20:52:04 kernel: [ 1060.804185] [] ? alarm_timer_callback+0x68/0xe0 [nouveau]
20:52:04 kernel: [ 1060.804192] [] nouveau_therm_alarm+0x1a/0x20 [nouveau]
20:52:04 kernel: [ 1060.804200] [] nv04_timer_alarm_trigger+0x120/0x170 [nouveau]
20:52:04 kernel: [ 1060.804208] [] nv04_timer_alarm+0x7b/0xe0 [nouveau]
20:52:04 kernel: [ 1060.804215] [] nouveau_fantog_update+0x15f/0x180 [nouveau]
20:52:04 kernel: [ 1060.804216] [] ? native_sched_clock+0x2a/0x90
20:52:04 kernel: [ 1060.804223] [] nouveau_fantog_alarm+0x1a/0x20 [nouveau]
20:52:04 kernel: [ 1060.804230] [] nv04_timer_alarm_trigger+0x120/0x170 [nouveau]
20:52:04 kernel: [ 1060.804237] [] nv04_timer_intr+0x6b/0x90 [nouveau]
20:52:04 kernel: [ 1060.804245] [] nouveau_mc_intr+0x12c/0x1b0 [nouveau]
20:52:04 kernel: [ 1060.804247] [] handle_irq_event_percpu+0x77/0x1a0
20:52:04 kernel: [ 1060.804248] [] handle_irq_event+0x41/0x70
20:52:04 kernel: [ 1060.804250] [] handle_edge_irq+0x6e/0x120
20:52:04 kernel: [ 1060.804251] [] handle_irq+0x22/0x40
20:52:04 kernel: [ 1060.804253] [] do_IRQ+0x4f/0xf0
20:52:04 kernel: [ 1060.804254] [] common_interrupt+0x6d/0x6d
20:52:04 kernel: [ 1060.804254] [] ? cpuidle_enter_state+0x65/0x160
20:52:04 kernel: [ 1060.804257] [] ? cpuidle_enter_state+0x51/0x160
20:52:04 kernel: [ 1060.804258] [] cpuidle_enter+0x17/0x20
20:52:04 kernel: [ 1060.804260] [] cpu_startup_entry+0x311/0x3b0
20:52:04 kernel: [ 1060.804262] [] rest_init+0x77/0x80
20:52:04 kernel: [ 1060.804264] [] start_kernel+0x487/0x494
20:52:04 kernel: [ 1060.804266] [] ? early_idt_handler_array+0x120/0x120
20:52:04 kernel: [ 1060.804267] [] x86_64_start_reservations+0x2a/0x2c
20:52:04 kernel: [ 1060.804269] [] x86_64_start_kernel+0x143/0x152
20:52:04 kernel: [ 1060.804269] ---[ end trace 5ffc33a915606ef1 ]---
20:52:04 kernel: [ 1071.594479] NMI watchdog: BUG: soft lockup - CPU#3 stuck for 23s! [thermald:888]
20:52:04 kernel: [ 1071.594481] Modules linked in: ctr ccm rfcomm bnep nls_iso8859_1 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec arc4 snd_hwdep nouveau ath9k ath9k_common ath9k_hw snd_pcm intel_rapl iosf_mbi mxm_wmi snd_seq_midi x86_pkg_temp_thermal snd_seq_midi_event intel_powerclamp snd_rawmidi ath3k wmi btusb coretemp ath mac80211 kvm_intel kvm cfg80211 ttm drm_kms_helper bluetooth drm snd_seq dcdbas i2c_algo_bit mei_me snd_seq_device snd_timer crct10dif_pclmul crc32_pclmul ghash_clmulni_intel mei aesni_intel snd video shpchp aes_x86_64 lrw gf128mul soundcore mac_hid lpc_ich glue_helper serio_raw ablk_helper cryptd parport_pc ppdev lp parport autofs4 uas usb_storage hid_generic usbhid hid psmouse ahci r8169 libahci mii
20:52:04 kernel: [ 1071.594508] CPU: 3 PID: 888 Comm: thermald Tainted: G W 3.19.0-26-generic #28-Ubuntu
20:52:04 kernel: [ 1071.594508] Hardware name: Dell Inc. XPS 8700/0KWVT8, BIOS A07 03/13/2014
20:52:04 kernel: [ 1071.594509] task: ffff8802123475c0 ti: ffff88020ac78000 task.ti: ffff88020ac78000
20:52:04 kernel: [ 1071.594510] RIP: 0010:[] [] generic_exec_single+0xd6/0x190
20:52:04 kernel: [ 1071.594515] RSP: 0018:ffff88020ac7bc58 EFLAGS: 00000202
20:52:04 kernel: [ 1071.594516] RAX: 0000000000000100 RBX: 0000000000000292 RCX: 0000000000000001
20:52:04 kernel: [ 1071.594516] RDX: ffff88021ecce040 RSI: 0000000000000000 RDI: 0000000000000292
20:52:04 kernel: [ 1071.594517] RBP: ffff88020ac7bc88 R08: ffff88021ecce028 R09: 0000000000000000
20:52:04 kernel: [ 1071.594518] R10: 0000000000000004 R11: 0000000000000293 R12: 0000000000000292
20:52:04 kernel: [ 1071.594518] R13: ffff88020ac7bc28 R14: 0000000000000001 R15: 0000000000080000
20:52:04 kernel: [ 1071.594519] FS: 00007f92c7c8b700(0000) GS:ffff88021ecc0000(0000) knlGS:0000000000000000
20:52:04 kernel: [ 1071.594520] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
20:52:04 kernel: [ 1071.594520] CR2: 00007f1877ca6010 CR3: 00000000dd92c000 CR4: 00000000001407e0
20:52:04 kernel: [ 1071.594521] Stack:
20:52:04 kernel: [ 1071.594522] 0000000000000000 ffffffff813e6310 ffff88020ac7bcc8 0000000000000003
20:52:04 kernel: [ 1071.594523] 0000000000000000 ffffffff813e6310 ffff88020ac7bcb8 ffffffff810f4787
20:52:04 kernel: [ 1071.594524] ffff880212776020 ffffffff81216474 ffff88020ac7bd14 ffff88020ac7bd10
20:52:04 kernel: [ 1071.594525] Call Trace:
20:52:04 kernel: [ 1071.594529] [] ? ucs2_strncmp+0x60/0x60
20:52:04 kernel: [ 1071.594530] [] ? ucs2_strncmp+0x60/0x60
20:52:04 kernel: [ 1071.594532] [] smp_call_function_single+0x67/0xa0
20:52:04 kernel: [ 1071.594534] [] ? mntput+0x24/0x40
20:52:04 kernel: [ 1071.594535] [] rdmsr_on_cpu+0x4e/0x70
20:52:04 kernel: [ 1071.594537] [] sys_get_curr_temp+0x39/0x90 [x86_pkg_temp_thermal]
20:52:04 kernel: [ 1071.594540] [] thermal_zone_get_temp+0x6e/0x110
20:52:04 kernel: [ 1071.594542] [] ? mntput+0x24/0x40
20:52:04 kernel: [ 1071.594543] [] temp_show+0x1e/0x40
20:52:04 kernel: [ 1071.594546] [] dev_attr_show+0x20/0x60
20:52:04 kernel: [ 1071.594549] [] ? mutex_lock+0x16/0x40
20:52:04 kernel: [ 1071.594552] [] sysfs_kf_seq_show+0xb6/0x150
20:52:04 kernel: [ 1071.594553] [] kernfs_seq_show+0x23/0x30
20:52:04 kernel: [ 1071.594555] [] seq_read+0xcd/0x3b0
20:52:04 kernel: [ 1071.594556] [] kernfs_fop_read+0x105/0x170
20:52:04 kernel: [ 1071.594558] [] ? security_file_permission+0x84/0xa0
20:52:04 kernel: [ 1071.594561] [] __vfs_read+0x18/0x50
20:52:04 kernel: [ 1071.594562] [] vfs_read+0x8a/0x140
20:52:04 kernel: [ 1071.594563] [] SyS_read+0x46/0xb0
20:52:04 kernel: [ 1071.594565] [] system_call_fastpath+0x16/0x1b
20:52:04 kernel: [ 1071.594566] Code: c2 00 52 01 00 48 03 14 c5 40 86 d2 81 48 89 de 48 89 df e8 1d 4b 2d 00 84 c0 74 0b e9 9c 00 00 00 0f 1f 40 00 f3 90 f6 43 18 01 f8 31 c0 48 83 c4 20 5b 41 5c 5d c3 0f 1f 44 00 00 49 63 c4
20:52:11 rtkit-daemon[1562]: The canary thread is apparently starving. Taking action.
20:52:11 rtkit-daemon[1562]: Demoting known real-time threads.
20:52:11 rtkit-daemon[1562]: Successfully demoted thread 1676 of process 1561 (n/a).
20:52:11 rtkit-daemon[1562]: Successfully demoted thread 1675 of process 1561 (n/a).
20:52:11 rtkit-daemon[1562]: Successfully demoted thread 1657 of process 1561 (n/a).
20:52:11 rtkit-daemon[1562]: Successfully demoted thread 1561 of process 1561 (n/a).
20:52:11 rtkit-daemon[1562]: Demoted 4 threads.
20:52:21 rtkit-daemon[1562]: The canary thread is apparently starving. Taking action.
20:52:21 rtkit-daemon[1562]: Demoting known real-time threads.
20:52:21 rtkit-daemon[1562]: Successfully demoted thread 1676 of process 1561 (n/a).
20:52:21 rtkit-daemon[1562]: Successfully demoted thread 1675 of process 1561 (n/a).
20:52:21 rtkit-daemon[1562]: Successfully demoted thread 1657 of process 1561 (n/a).
20:52:21 rtkit-daemon[1562]: Successfully demoted thread 1561 of process 1561 (n/a).
20:52:21 rtkit-daemon[1562]: Demoted 4 threads.
20:52:31 rtkit-daemon[1562]: The canary thread is apparently starving. Taking action.
20:52:31 rtkit-daemon[1562]: Demoting known real-time threads.
20:52:31 rtkit-daemon[1562]: Successfully demoted thread 1676 of process 1561 (n/a).
20:52:31 rtkit-daemon[1562]: Successfully demoted thread 1675 of process 1561 (n/a).
20:52:31 rtkit-daemon[1562]: Successfully demoted thread 1657 of process 1561 (n/a).
20:52:31 rtkit-daemon[1562]: Successfully demoted thread 1561 of process 1561 (n/a).
20:52:31 rtkit-daemon[1562]: Demoted 4 threads.
20:52:32 kernel: [ 1099.584442] NMI watchdog: BUG: soft lockup - CPU#3 stuck for 23s! [thermald:888]
20:52:32 kernel: [ 1099.584444] Modules linked in: ctr ccm rfcomm bnep nls_iso8859_1 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec arc4 snd_hwdep nouveau ath9k ath9k_common ath9k_hw snd_pcm intel_rapl iosf_mbi mxm_wmi snd_seq_midi x86_pkg_temp_thermal snd_seq_midi_event intel_powerclamp snd_rawmidi ath3k wmi btusb coretemp ath mac80211 kvm_intel kvm cfg80211 ttm drm_kms_helper bluetooth drm snd_seq dcdbas i2c_algo_bit mei_me snd_seq_device snd_timer crct10dif_pclmul crc32_pclmul ghash_clmulni_intel mei aesni_intel snd video shpchp aes_x86_64 lrw gf128mul soundcore mac_hid lpc_ich glue_helper serio_raw ablk_helper cryptd parport_pc ppdev lp parport autofs4 uas usb_storage hid_generic usbhid hid psmouse ahci r8169 libahci mii
20:52:32 kernel: [ 1099.584469] CPU: 3 PID: 888 Comm: thermald Tainted: G W L 3.19.0-26-generic #28-Ubuntu
20:52:32 kernel: [ 1099.584470] Hardware name: Dell Inc. XPS 8700/0KWVT8, BIOS A07 03/13/2014
20:52:32 kernel: [ 1099.584471] task: ffff8802123475c0 ti: ffff88020ac78000 task.ti: ffff88020ac78000
20:52:32 kernel: [ 1099.584472] RIP: 0010:[] [] generic_exec_single+0xd6/0x190
20:52:32 kernel: [ 1099.584477] RSP: 0018:ffff88020ac7bc58 EFLAGS: 00000202
20:52:32 kernel: [ 1099.584477] RAX: 0000000000000100 RBX: 0000000000000292 RCX: 0000000000000001
20:52:32 kernel: [ 1099.584478] RDX: ffff88021ecce040 RSI: 0000000000000000 RDI: 0000000000000292
20:52:32 kernel: [ 1099.584478] RBP: ffff88020ac7bc88 R08: ffff88021ecce028 R09: 0000000000000000
20:52:32 kernel: [ 1099.584479] R10: 0000000000000004 R11: 0000000000000293 R12: 0000000000000292
20:52:32 kernel: [ 1099.584480] R13: ffff88020ac7bc28 R14: 0000000000000001 R15: 0000000000080000
20:52:32 kernel: [ 1099.584480] FS: 00007f92c7c8b700(0000) GS:ffff88021ecc0000(0000) knlGS:0000000000000000
20:52:32 kernel: [ 1099.584481] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
20:52:32 kernel: [ 1099.584482] CR2: 00007f1877ca6010 CR3: 00000000dd92c000 CR4: 00000000001407e0
20:52:32 kernel: [ 1099.584483] Stack:
20:52:32 kernel: [ 1099.584483] 0000000000000000 ffffffff813e6310 ffff88020ac7bcc8 0000000000000003
20:52:32 kernel: [ 1099.584484] 0000000000000000 ffffffff813e6310 ffff88020ac7bcb8 ffffffff810f4787
20:52:32 kernel: [ 1099.584485] ffff880212776020 ffffffff81216474 ffff88020ac7bd14 ffff88020ac7bd10
20:52:32 kernel: [ 1099.584486] Call Trace:
20:52:32 kernel: [ 1099.584490] [] ? ucs2_strncmp+0x60/0x60
20:52:32 kernel: [ 1099.584491] [] ? ucs2_strncmp+0x60/0x60
20:52:32 kernel: [ 1099.584493] [] smp_call_function_single+0x67/0xa0
20:52:32 kernel: [ 1099.584495] [] ? mntput+0x24/0x40
20:52:32 kernel: [ 1099.584496] [] rdmsr_on_cpu+0x4e/0x70
20:52:32 kernel: [ 1099.584498] [] sys_get_curr_temp+0x39/0x90 [x86_pkg_temp_thermal]
20:52:32 kernel: [ 1099.584501] [] thermal_zone_get_temp+0x6e/0x110
20:52:32 kernel: [ 1099.584503] [] ? mntput+0x24/0x40
20:52:32 kernel: [ 1099.584504] [] temp_show+0x1e/0x40
20:52:32 kernel: [ 1099.584507] [] dev_attr_show+0x20/0x60
20:52:32 kernel: [ 1099.584509] [] ? mutex_lock+0x16/0x40
20:52:32 kernel: [ 1099.584512] [] sysfs_kf_seq_show+0xb6/0x150
20:52:32 kernel: [ 1099.584514] [] kernfs_seq_show+0x23/0x30
20:52:32 kernel: [ 1099.584515] [] seq_read+0xcd/0x3b0
20:52:32 kernel: [ 1099.584517] [] kernfs_fop_read+0x105/0x170
20:52:32 kernel: [ 1099.584519] [] ? security_file_permission+0x84/0xa0
20:52:32 kernel: [ 1099.584521] [] __vfs_read+0x18/0x50
20:52:32 kernel: [ 1099.584523] [] vfs_read+0x8a/0x140
20:52:32 kernel: [ 1099.584524] [] SyS_read+0x46/0xb0
20:52:32 kernel: [ 1099.584526] [] system_call_fastpath+0x16/0x1b
20:52:32 kernel: [ 1099.584527] Code: c2 00 52 01 00 48 03 14 c5 40 86 d2 81 48 89 de 48 89 df e8 1d 4b 2d 00 84 c0 74 0b e9 9c 00 00 00 0f 1f 40 00 f3 90 f6 43 18 01 f8 31 c0 48 83 c4 20 5b 41 5c 5d c3 0f 1f 44 00 00 49 63 c4
20:52:36 kernel: [ 1103.806889] INFO: rcu_sched detected stalls on CPUs/tasks: { 0} (detected by 3, t=15002 jiffies, g=110501, c=110500, q=0)
20:52:36 kernel: [ 1103.806894] Task dump for CPU 0:
20:52:36 kernel: [ 1103.806895] swapper/0 R running task 0 0 0 0x00000008
20:52:36 kernel: [ 1103.806897] 0000000000000010 0000000000000202 ffffffff81c03e68 0000000000000018
20:52:36 kernel: [ 1103.806898] ffffffff816660d1 0000000000000000 000000f3264c1dd7 ffffffff81c03e98
20:52:36 kernel: [ 1103.806899] ffffffff81d29460 ffff88021ec1bc00 ffffffff81c00000 ffffffff81ca9880
20:52:36 kernel: [ 1103.806900] Call Trace:
20:52:36 kernel: [ 1103.806905] [] ? cpuidle_enter_state+0x51/0x160
20:52:36 kernel: [ 1103.806906] [] ? cpuidle_enter+0x17/0x20
20:52:36 kernel: [ 1103.806908] [] ? cpu_startup_entry+0x311/0x3b0
20:52:36 kernel: [ 1103.806911] [] ? rest_init+0x77/0x80
20:52:36 kernel: [ 1103.806914] [] ? start_kernel+0x487/0x494
20:52:36 kernel: [ 1103.806916] [] ? early_idt_handler_array+0x120/0x120
20:52:36 kernel: [ 1103.806918] [] ? x86_64_start_reservations+0x2a/0x2c
20:52:36 kernel: [ 1103.806919] [] ? x86_64_start_kernel+0x143/0x152
20:52:41 rtkit-daemon[1562]: The canary thread is apparently starving. Taking action.
20:52:41 rtkit-daemon[1562]: Demoting known real-time threads.
20:52:41 rtkit-daemon[1562]: Successfully demoted thread 1676 of process 1561 (n/a).
20:52:41 rtkit-daemon[1562]: Successfully demoted thread 1675 of process 1561 (n/a).
20:52:41 rtkit-daemon[1562]: Successfully demoted thread 1657 of process 1561 (n/a).
20:52:41 rtkit-daemon[1562]: Successfully demoted thread 1561 of process 1561 (n/a).
20:52:41 rtkit-daemon[1562]: Demoted 4 threads.
20:52:51 rtkit-daemon[1562]: The canary thread is apparently starving. Taking action.
20:52:51 rtkit-daemon[1562]: Demoting known real-time threads.
20:52:51 rtkit-daemon[1562]: Successfully demoted thread 1676 of process 1561 (n/a).
20:52:51 rtkit-daemon[1562]: Successfully demoted thread 1675 of process 1561 (n/a).
20:52:51 rtkit-daemon[1562]: Successfully demoted thread 1657 of process 1561 (n/a).
20:52:51 rtkit-daemon[1562]: Successfully demoted thread 1561 of process 1561 (n/a).
20:52:51 rtkit-daemon[1562]: Demoted 4 threads.看http://pastebin.com/TNJrdDEj第二个崩溃日志（系统启动后不到 5 分钟就崩溃了）。无法在此处发布，因为超出了字符数限制。
答案1
您没有安装专有的 NVIDIA 驱动程序。在终端中运行：
sudo apt-get install nvidia-346 nvidia-prime
然后重新启动。