No version of Ubuntu can be installed with any Skylake 6th generation Intel processor

Boot with nomodeset boot parameter as it is described in this answer.

You will be able to install Ubuntu. After you do it, the system will probably won't boot again.

You will have to get to grub menu by pressing Shift or ESC button and enter nomodeset again.

Then install 4.3 kernel. It can be done this way. Run in terminal:

mkdir ~/linux-4.3
cd ~/linux-4.3
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.3-wily/linux-headers-4.3.0-040300-generic_4.3.0-040300.201511020949_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.3-wily/linux-headers-4.3.0-040300_4.3.0-040300.201511020949_all.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.3-wily/linux-image-4.3.0-040300-generic_4.3.0-040300.201511020949_amd64.deb
sudo dpkg -i *.deb

and reboot. I hope the system will boot without the nomodeset parameter.

Notice: The kernel will not get updates. You will need to install them manually from Mainline kernel PPA.

I've got Ubuntu 15.10 Mate running fine with Metacity installed, as it seems more stable.

I thought Ubuntu had made tweaks to the stock kernel of 4.2 for Skylake read here:

http://www.phoronix.com/scan.php?page=news_item&px=intel-skl-prelim-support

I'm running a sixth generation intel core i5 6500. Had a few slight issues under compbiz and marco (partial screen freeze) but metacity has been stable for days. I've got a core i5 6500 with a Gigabyte B150M D3H motherboard and DDR4 ram (8GB). Just using on board graphics.

The only issue I've had in the last few days whilst using metacity is youtube on Chrome will cause a strange ghosting of the browser if I attempt to move the browser along the screen, so I use firefox for YT and its fine. Its been quite stable thus far.

New kernel version 4.8.10 (November 23, 2016)

Steps everyone can take are to ensure Intel microcode is up to date. See the answer here: (Ubuntu 16.04 Skylake overheating)

Instead of kernel 4.2, 4.3 or 4.4.2 in the other answers here you should upgrade to kernel 4.8.10 which has good reviews / improvments:

cd /tmp
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8.10/linux-headers-4.8.10-040810_4.8.10-040810.201611210531_all.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8.10/linux-headers-4.8.10-040810-generic_4.8.10-040810.201611210531_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8.10/linux-image-4.8.10-040810-generic_4.8.10-040810.201611210531_amd64.deb
sudo dpkg -i *.deb
sudo reboot

After installing the new kernel you can try to roll out grub command line changes for nomodeset, i915.preliminary_hw_support=1, etc. you fudged to make earlier kernels and drivers work.

Please note kernel version 4.9 LTS will be out soon. We all hope Intel fixes the pstate / cstate / thermald issues plaguing many of us in the LTS kernel release.

I had the same issue, that I wasn't able to install Ubuntu 15.10 on my new Thinkpad. Therefore I add here my solution to the problem, because it could help someone. I tried different kernel parameters in the boot options and I got it to work when I replaced quiet splash --- with:

i915.preliminary_hw_support=1 nouveau.blacklist=1 edd=on nolapic pcie_aspm=force tpm_tis.interrupts=0 ---

After I was able to boot into my Ubuntu installation I made a update of the kernel to 4.3 and now I only use one kernel parameter nolapic to start it. But to enable the touch and digitizer I need to add i915.preliminary_hw_support=1 .