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Apparently, Xubuntu is totally unable to wake up. So when it goes to sleep, for whatever reason, you lose all usaved work. No Ctrl+Alt+F1, nothing. It is there, the machine is on, but the only thing you can do is a hard shut down.

After various unsuccessful attempts at correcting the problem, I just turned off all power management options.

tab1 tab2 tab3

But it still goes to sleep/death after 45 minutes, the default setting.

What can I do to just turn off all sleep functions?

I'm using Xubuntu 16.04 on a Intel NUC. Before that I was using plain Ubuntu on this same machine (but it took too much RAM) and it could wake up without any problem.

2

Caffeine

You could give caffeine a try - quoting the launchpad page:

A status bar application able to temporarily prevent the activation of both the screensaver and the "sleep" powersaving mode.

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  • I'd rather uninstall something :) BTW I removed "light locker" but no luck. Anybody here knows what process is actually handling the suspend? – yPhil Jun 18 '16 at 12:01

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