I thought I'd let the Community know about my Asus X453M laptop that would not shut down, and had endless problems with the ACPI when starting up.

I bought the laptop at a local retailer in Chiang Mai, Thailand, Fantastic computer once it loaded Ubuntu, but a struggle to get it started up. Recovery Mode did the trick most of the time.

I took it back to the retailer, and they patched the BIOS with the latest update from Asus.

Bingo, works fine now, If you come across this problem don't waste your time trying to figure out what is wrong with the Ubuntu installation.