看过这些问题，
所有问题都解决启动问题，原因不同，因此附加一个日志文件，如果它显示延迟的原因。
这是一个 Kubuntu 15.10 系统，
系统在输入密码前一切正常。输入密码后，系统加载面板和菜单的速度会变慢。鼠标可用，甚至ctrl+Esc可以使用，但菜单不可用。
日志，
[ 19.996858] nvidia: module license 'NVIDIA' taints kernel.
[ 19.996865] Disabling lock debugging due to kernel taint
[ 20.006872] nvidia: module verification failed: signature and/or required key missing - tainting kernel
[ 20.013589] vgaarb: device changed decodes: PCI:0000:01:00.0,olddecodes=io+mem,decodes=none:owns=io+mem
[ 20.013967] [drm] Initialized nvidia-drm 0.0.0 20150116 for 0000:01:00.0 on minor 0
[ 20.013976] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 352.63 Sat Nov 7 21:25:42 PST 2015
[ 20.864120] Adding 2949116k swap on /dev/sda6. Priority:-1 extents:1 across:2949116k FS
[ 22.152779] IPv6: ADDRCONF(NETDEV_UP): enp3s0: link is not ready
[ 22.241323] r8169 0000:03:00.0 enp3s0: link down
[ 22.241335] r8169 0000:03:00.0 enp3s0: link down
[ 22.241377] IPv6: ADDRCONF(NETDEV_UP): enp3s0: link is not ready
[ 24.384687] r8169 0000:03:00.0 enp3s0: link up
[ 24.384704] IPv6: ADDRCONF(NETDEV_CHANGE): enp3s0: link becomes ready
[ 2105.330193] PM: Syncing filesystems ... done.
[ 2105.607910] PM: Preparing system for sleep (mem)
[ 2106.055124] Freezing user space processes ... (elapsed 0.001 seconds) done.
[ 2106.057091] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
[ 2106.058232] PM: Suspending system (mem)
[ 2106.058309] Suspending console(s) (use no_console_suspend to debug)
[ 2106.058947] sd 3:0:0:0: [sdb] Synchronizing SCSI cache
[ 2106.059053] sd 2:0:0:0: [sda] Synchronizing SCSI cache
[ 2106.061721] sd 2:0:0:0: [sda] Stopping disk
[ 2106.061771] sd 3:0:0:0: [sdb] Stopping disk
[ 2106.062144] serial 00:03: disabled
[ 2106.062150] serial 00:03: System wakeup disabled by ACPI
[ 2106.572053] PM: suspend of devices complete after 513.339 msecs
[ 2106.572634] PM: late suspend of devices complete after 0.578 msecs
我看到延迟介于
[ 24.384704] IPv6: ADDRCONF(NETDEV_CHANGE): enp3s0: link becomes ready
和
[ 2105.330193] PM: Syncing filesystems ... done.
这是什么原因？如何解决？谢谢。