Kernel panic after update to 4.4.0-108-generic

Do not install 4.4.0-108-generic on Xenial! It breaks boot/reboot/shutdown/suspend functionality!

Install 4.4.0-109-generic (see USN-3522-3 for details)!

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Reboot to the last working kernel and remove 4.4.0-108-generic:

1. Press Shift between UEFI/BIOS and login-screen to enter GRUB
2. In GRUB select Advanced options for Ubuntu and select Ubuntu, with Linux 4.4.0-xxx-generic (where xxx < 108)

3. Login to the system and remove this buggy 4.4.0-108-generic and install 4.4.0-104-generic instead.

   sudo apt-get purge linux-headers-4.4.0-108 linux-headers-4.4.0-108-generic \
   linux-image-4.4.0-108-generic linux-image-extra-4.4.0-108-generic \
   linux-tools-4.4.0-108 linux-tools-4.4.0-108-generic
   sudo apt-get autoremove
   sudo apt-get install linux-headers-4.4.0-104 linux-headers-4.4.0-104-generic \
   linux-image-4.4.0-104-generic linux-image-extra-4.4.0-104-generic \
   linux-tools-4.4.0-104 linux-tools-4.4.0-104-generic
   

As of 2018-01-10 18:00 UTC, the 4.4.0-109-generic kernel seems to be distributed on mirrors.

But if you want you can select Main server (http://archive.ubuntu.com/ubuntu).
You can switch to it from software-properties-gtk / software-properties-kde.

You can install 4.4.0-109-generic with the following commands:

sudo apt-get update
sudo apt-get install linux-headers-4.4.0-109 linux-headers-4.4.0-109-generic \
linux-headers-generic linux-image-4.4.0-109-generic \
linux-image-extra-4.4.0-109-generic linux-image-generic \
linux-tools-4.4.0-109 linux-tools-4.4.0-109-generic linux-tools-generic

In your boot menu choose advanced options for ubuntu.

You can boot from an older kernel (that is still installed) there.