I shut my system down every night.

Same as a lot of others, my 'desktop' is actually my laptop, so i shut it down when not using it.

Before my actual desktop pc died (capacitors busted on motherboard due to heat) it never was shutdown unless there was a power outage or i hadn't upgraded my kernel in a long while and decided too... in Australian summertime.. more than likely the cause of its demise...

Pretty much just kernel upgrades.

I shut down the computer every night, and then start it up every morning.
But, rebooting during the daily usage, happens only a couple of times a year.

Only for kernel updates

I can't remember the last time I rebooted, but I changed kernels a while back, and rebooted then. Haven't needed to since. Or if I change hardware and have to shutdown but that was before I installed the last kernel..

This thing is freakishly stable.

I use to reboot no more than once a month, usually for updates (always used Ubuntu distros and currently running 12.04 LTS). About a week ago something changed for the worse... and now my poor Linux box is paralytically slow and occasionally freezing up, forcing daily reboots.

Only when there are kernel or security update

I think that's what's making Ubuntu get its knickers in a twist but, the upside is, it gives me a chance to make another coffee

Once a day (or sometimes twice) on the main desktop. On an as needed basis for the second desktop, tablet and laptop. cheers

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Any time maybe I will reboot.
More than one time per day.

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"Weekly"; usually for system update. Occasionally, there's a hangup that requires a complete re-boot, but that frequency is more like "monthly." Laptop- Ubuntu 12.04.

Well I voted for "Only for kernel updates" because that is the closest.

"As needed" would be a more appropriate answer for me. For example when I upgrade KDE, I aways reboot. I upgrade a boot load of packages I normally reboot, depends on what was upgraded. I also reboot if I make changes to the boot up scripts to make sure they work as I intended. Outside of those reasons I can't think of any others.

I don't count these as a reboot. Any shutdown. For example, we lost power three times today. The UPS handled the first short one and the second longer one, a shutdown. I was not home home at the time and with the third power outage the system was already off.

I shutdown daily for power saving

daily for power saving