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Sometimes when updating or installing a package, Ubuntu recommends to reboot the PC. The blue circle arrow appears. What type of packages do this and why?

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Running device modules, running services, CUPS etc. – Uri Herrera Feb 23 '12 at 3:25
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Usually only packages for kernel upgrades, video card drivers and other hardware device drivers recommend rebooting.

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Those are the obvious candidates.. but even when not installing those, I get the "reboot" arrow appearing. I (and the OP) wonder why. – Chan-Ho Suh Feb 23 '12 at 5:05

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