I solved this bug (and also
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1724657) by
inserting intel-ucode.img (taken from recent arch linux iso) as first
initrd into grub.cfg. This updates the microcode very early in the boot
process. And this way I can use the live iso without having to install
to hard drive and install additional packages and so on.

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https://bugs.launchpad.net/bugs/1724650

Title:
  [Firmware Bug]: TSC_DEADLINE disabled due to Errata; please update
  microcode to version: 0x25 (or later)

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