我刚刚遇到了一个非常奇怪的启动（因为我在 grub 选项中没有“quiet”或“splash”）。所以我查看了日志：
crysman@crysman-U36SD:~$ cat /var/log/boot.log
* Starting Bridge file events into upstart [ OK ]
Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox
Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd
* Starting SystemD login management service [ OK ]
* Starting AppArmor profiles [ OK ]
* Starting bluetooth daemon [ OK ]
* Starting startpar bridge for notification of upstart job start/stop [ OK ]
* Stopping startpar bridge for notification of upstart job start/stop [ OK ]
* Starting mDNS/DNS-SD daemon [ OK ]
* Starting Reload cups, upon starting avahi-daemon to make sure remote queues are populated [ OK ]
* Starting Reload cups, upon starting avahi-daemon to make sure remote queues are populated [fail]
* Setting sensors limits [ OK ]
* Setting up X socket directories... [ OK ]
* Stopping System V initialisation compatibility [ OK ]
* Starting network connection manager [ OK ]
* Starting System V runlevel compatibility [ OK ]
* Starting [ OK ]
* Starting automatic crash report generation [ OK ]
* Starting [ OK ]
* Starting cups-browsed - Bonjour remote printer browsing daemon [ OK ]
* Starting Restore Sound Card State [ OK ]
* Starting ACPI daemon [ OK ]
* Starting anac(h)ronistic cron [ OK ]
* Starting [ OK ]
* Starting [ OK ]
* Starting save kernel messages [ OK ]
* Starting [ OK ]
* Starting [ OK ]
* Stopping Restore Sound Card State [ OK ]
* Starting CPU interrupts balancing daemon [ OK ]
* Starting startpar bridge for notification of upstart job start/stop [ OK ]
* Stopping startpar bridge for notification of upstart job start/stop [ OK ]
* Stopping Restore Sound Card State [ OK ]
* Starting startpar bridge for notification of upstart job start/stop [ OK ]
* Stopping startpar bridge for notification of upstart job start/stop [ OK ]
* Stopping save kernel messages [ OK ]
* Starting regular background program processing daemon [ OK ]
* Stopping anac(h)ronistic cron [ OK ]
有重复条目、反复开始/停止、空条目（如“* 开始”）... 为什么会这样？您能想到什么原因吗？
那个“startpar bridge”和空的“Starting”条目直到今天才出现（我安装了一些东西）。
多谢
我正在运行 Xubuntu 13.10（3 天前全新安装）其他调试信息：
cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.11.0-12-generic root=UUID=751f644f-5523-465f-bbaa-ef75ed4373f1 ro i915.i915_enable_rc6=1