I recently purchased a GA-990XA-UD3 and experienced this problem. This is an UEFI board, with support for Legacy boot, etc. I had no problems creating a TAILS persistent USB flash disk, within TAILS DVD. It booted normally from USB.
But then, when I used a Sandisk Cruzer Blade (another flash drive) to create a standard Ubuntu 15.04 Live USB, using the tool called "Universal Boot Installer", following the right steps. Everything in place, FAT32, etc, and to my surprise.... "Missing operating system". I found out that the flash drive had two configurations, when investigating through gparted, and fdisk. 1) The flash drive was as GPT partition. 2) It had the msftdata flag. I don't know WHICH one of those could have caused the problem. I think this happened to this flash pendrive when I was playing around with "Windows 8 Disk Management" tools. What I did was to completely wipe the flash drive, with gparted, recreating the partition table as msdos, and formatting as FAT32. Using "Universal USB Installer" recreated the system, and then I found out it also flagged the drive as "boot, lba". I hope this helps, if you're stuck. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/277903 Title: Missing Operating System [message at boot] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-cdimage/+bug/277903/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
