Click Start to check the hard disk.. Right click the hard disk you want to check. It show Operating system not found in the VM. I continue to click next and on the next page I choice the Guest operating system type for Linux and for Version type i choice Ubuntu. 因为是第一次装Ubuntu,所以我在安装之前看了挺多教程的,后面发现都是这些教程害的,教程可能没错,但是不适用大多数安装情况。 Launch AOMEI Partition Assistant. Vmware安装过程很简单,很快就装好了,但是在VM中安装Ubuntu16.04遇到了一个严重的问题:operating system not found. On the machine, when I select boot from USB, it gives me the error, "An operating system wasn't found. 问题. I find it quite strange that I have to enable this in order to make my installation work, as I never did this with Ubuntu. I found an option in my BIOS to enable UEFI, but it is disabled by default. I updated to 13.04 in April - no trouble there. Try disconnecting any drives that don't contain an operating system." I have reinstalled Esxi and Workstation 9 and they run as an administrator but the issue is the same. I have re-installed Ubuntu entirely about 3 times now, then install Linux Mint 15, also 2 times, and every time the result is the same. So the OS won't boot if you haven't plugged in your USB. 2. dpkg: With this, you can repair broken software packages. clean: Use this to make free space, useful if the reason for Ubuntu not booting is a lack of HDD space. If you plug in the USB and boot into it, it will display a message as 'Operating system not found' since the USB contain no bootable OS. So that works. But since the boot loader is present, it boot up the previously installed OS. : This is the file system check tool, which scans the hard disk drive and repairs any errors it finds. thank you for your help If you need more, you can use the Discover Software Center to download the required app that suits your needs, for free. Ubuntu installation wizard will automatically detect your Windows if you are installing in dual boot, but in some cases, if you encounter "This computer currently has no detected operating system" warning, then this guide will help you to resolve this issue. The boot loader makes the OS to load into the memory and run. After the new update to 13.10, the BIOS won't find the OS any more. I just get the message Operating system not found. After finish the setup, I start the virtual machine. Select Surface Test.. 3. Eventually, I made to install Ubuntu 12.10. If I enable the third option (see pic), then I can boot the CD in UEFI mode. Failed software installations or updates can cause problems with Ubuntu not starting. Using USB to ISO, I put Ubuntu 12.04 i386 on my USB and then connected it to another machine. Operating system not found. If there is nothing wrong with the hard drive, you can find other solutions for “operating system is not found” on Sony Vaio or other computer. 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