Hi, I've bought latitude 5401 with 32G RAM and 1TB ssd and pre-installed windows 10. I ant ot drop (or keep 2 os) Ubuntu. I've tried 16.04 and it boot fine to live but when start installation disk was not found. SO search forum and find out that BIOS sata option should be changed to AHCI but then problems started. I cannot then even boot windows and when select usb stick with Ubuntu I get error: Failed to open \EFI\BOOT\mmx64.efi - Not Found. When return sata option back as original I can boot windows but not live ubuntu anymore. Any ideas what else to check or how to workaround it. Thanks a lot.