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I have an Ubuntu 17.04 instance that randomly locks up. Nothing responds so I have to turn off the PC using the power button.

I've realised that the issue starts when I try to reboot my computer... Sometimes the wifi stops working for like 15 seconds and then asks me for the wifi password.

enter image description here

Zanna
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B. Amine
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    Could be almost anything. Identify your hardware and check your logs . See https://askubuntu.com/questions/4408/what-should-i-do-when-ubuntu-freezes – Panther Sep 07 '17 at 17:58
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    Need more info. What make/model computer? Show me sudo lshw -C cpu and sudo blkid and cat /etc/fstab and free -h and swapon -s. Edit that output into your question, not the comments, please. Ping me at @heynnema when you have this info and I'll take a look for you. – heynnema Sep 07 '17 at 19:02
  • im new in this blog. how can i ping you? – B. Amine Sep 07 '17 at 21:28
  • @B.Amine You can ping users with @, e.g., @EliahKagan pings me. See the "What happens when I comment?" section of this page for details. See also How do comment @replies work? The information you've added is helpful but please provide it as text instead of a screenshot. You can copy text from the terminal to the clipboard, [edit] your post to paste it in, then select the pasted text and press Ctrl+K (or click the {} button) to format it properly. Thanks! – Eliah Kagan Sep 08 '17 at 06:30
  • @B.Amine I've looked at your info. It mostly looks ok, but fstab looks a little strange. Did you manually partition your disk drive, or let Ubuntu handle it during the install? Show me sudo fdisk -l. The wi-fi issue might be a separate issue from the freezing. If after booting, you disconnect the wi-fi, and then reconnect, does it also ask for your password again? Also, please see my answer, below... – heynnema Sep 08 '17 at 13:52
  • @heynnema i did manually partition my daisk drive during the install with a 2 ext4 partitions(one for / and the other for /home) and a swap partition – B. Amine Sep 10 '17 at 18:52
  • @B.Amine I see one EXT4 / root partition, and a swapfile (not a partition). I'm missing /home either on the disk, or in /etc/fstab. – heynnema Sep 10 '17 at 19:04
  • @heynnema , maybe if i reinstall linux it will fix this issue? – B. Amine Sep 10 '17 at 19:13
  • @B.Amine couldn't hurt. Backup any important stuff, then do a complete "erase and install" (this will wipe the disk). If you don't have a specific reason to create a separate /home, then don't. Just use the default that Ubuntu lays down. – heynnema Sep 10 '17 at 19:17
  • @heynnema okay i will do this, thank you very much – B. Amine Sep 10 '17 at 20:44

2 Answers2

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Check to make sure that you have intel-microcode installed...

sudo apt-get update
sudo apt-get install intel-microcode

Go to www.memtest86.org and download the free memory test and run it at least one complete pass... more if you have the time. If it freezes during the test, then you have a hardware problem. ie: bad memory, or something else.

Update #1:

Do you have an encrypted swap?

heynnema
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Complete freeze can mean only 1 thing: any of all the drivers got stuck. This may be a faulty hardware or a faulty driver.

In practice, the first offender is an exotic hardware.

The second is faulty RAM. Use memtest to check it.

Then, Try removing all PC components that you can temporarily live without, like sound card or whatever.

Next candidate is a video card, because it is a most complicated piece of PC. If you have a CPU video card, or and old video card, try switching to it to see if the problem goes.

Barafu Albino
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