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I have a problem with my Ubuntu (14.04 LTS). My computer become crash after login (it took about 3-5 minutes to login). After that, It operated at very low speed.

The solutions I tried (and not working are) :

  • Reinstall Ubuntu (even a new version 16.04 LTS had the same problem).

  • Reboot and use boot repair USB disk ( It's fine after 1st reboot, but for the 2nd, 3rd, 4th ... The reboot stuck at login screen again)

  • Reinstall newest version graphic driver

My laptop details:

I took too much time in this issue, maybe somebody has a little insight, any help would be appreciated, thanks so much

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  • The time to login is excessive. My best guess based on the information provided is a failing hard disk. I recommend that you check the SMART status of your drive as it sounds like the root cause may be excessive retries accessing the disk.
    – Elder Geek
    Mar 2, 2017 at 17:24
  • Thank @Elder Geek I already checked the status of my hard disk, there is not any problems. So I use dmesg to screen out my reboot process:
    – vapham
    Mar 9, 2017 at 8:53
  • dmesg to screen out my reboot process: [ 201.963370] perf: interrupt took too long (2527 > 2500), lowering kernel.perf_event_max_sample_rate to 79000 [ 341.813119] perf: interrupt took too long (3214 > 3158), lowering kernel.perf_event_max_sample_rate to 62000 [ 933.817145] perf: interrupt took too long (4078 > 4017), lowering kernel.perf_event_max_sample_rate to 49000 [ 1042.969274] perf: interrupt took too long (5238 > 5097), lowering kernel.perf_event_max_sample_rate to 38000
    – vapham
    Mar 9, 2017 at 9:15
  • I don't think that's relevant to your problem and I would assume there is more to your reboot than what you have represented here. askubuntu.com/questions/621490/what-does-perf-interupt-mean If you have information to add to your post you should edit it into your post as comments can be deleted for a number of reasons.
    – Elder Geek
    Mar 9, 2017 at 13:54

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