It is a lot harder to keep a Windows system up to date than it is a Linux system. Ubuntu can update practically anything without a reboot short of the kernel, and if Google is using a LTS version of Ubuntu Kernel updates are rare. I have never had a normal piece of software ask me to reboot. Rarely ever am I asked any questions during an update(when grub updates I am sometimes asked questions, but that generally only happens when you do a rolling upgrade from one release to another).
Also, you can upgrade from one release of Ubuntu to the next in a single reboot without ever shutting the machine all the way down or booting off anything besides the main HDD. That makes it much easier to keep on top of OS versions.
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DBeta commented on Google Bans Microsoft Windows Company-Wide