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My servers behave strange 5 days now. They go to sleep mode after about 10 minutes and on again, and off, and on periodic. Power configuration is Suspend Off. I do not how to fix. Both servers are unstable like that after sudo apt dist-upgrade. Tried to downgrade to kernel 4.15 from 4.16 do not solve the problem. Please help.

Đan Điền Ngọc Huỳnh
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  • 18.04 is not released yet. Bugs are to be expected and need to be reported on launchpad. Upgrading a server to a not-released OS is not the best choice to make. You will probably need to re-install, and restore a backup to revert back to 16.04 if you can not fix yourself. – Rinzwind Mar 08 '18 at 13:52
  • Very good suggestion about not use Development version for something important. Thank you. – Đan Điền Ngọc Huỳnh Mar 08 '18 at 20:12
  • Same problem here. Desktop version, on Lenovo T430s, with rc4 kernel of 4.16. – Gelma Mar 11 '18 at 21:50

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Launch a bug report, it seems like it bug. however try Unity Tweak Tool it may have some power settings within it. if not disable sleep mode.

How do I disable my system from going to sleep?

Joel
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  • It is probably Gnome Tweak Tool now a days, since that the default DE for 18.04. – Soren A Mar 08 '18 at 13:49
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    Please do not provide answers for a server with software where you need a desktop. – Rinzwind Mar 08 '18 at 13:49
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    Thank you so much, Joel. I followed the link you provided. Tried the second guide with "sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target". And the two IoT servers is up and running again. Never sleep after 1 hour. Lovely. – Đan Điền Ngọc Huỳnh Mar 08 '18 at 20:17