Hi, I'm currently run Windows 8.1 Touch on my ASUS VivoBook X202E system. I've upgraded to SSD a few years ago.
I'm running Ubuntu along side Win 8.1. It works great and I like this setup.
I believe I'll want to prep the system before downloading and upgrading by removing fast boot & secure boot. I'm thinking the upgrade will overwrite my MBR and cause it to just boot to Windows 10? The reason I say this is because that's what it did when I upgraded from 8.0 to 8.1. I had to use Boot-Repair to get the dual boot to work again. I'm also pretty certain that the Ubuntu I'm running (14.04) is compliant with UEFI. I could verify this but I don't have my laptop on me ATM.

So, my question is twofold, has anyone performed an upgrade from 8.1 to 10 under a dual boot setup? And, if so, any issues with the touch screen interface or dual boot? Thanks for any ideas or tips before I "pull the trigger"