Launch AOMEI Partition Assistant. thank you for your help But since the boot loader is present, it boot up the previously installed OS. After the new update to 13.10, the BIOS won't find the OS any more. I found an option in my BIOS to enable UEFI, but it is disabled by default. After finish the setup, I start the virtual machine. 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. It show Operating system not found in the VM. 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. 2. The boot loader makes the OS to load into the memory and run. I have reinstalled Esxi and Workstation 9 and they run as an administrator but the issue is the same. Right click the hard disk you want to check. Lubuntu is a complete Operating System that ships the essential apps and services for daily use: office applications, PDF reader, image editor, music and video players, etc. Select Surface Test.. 3. 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。 I just get the message Operating system not found. There is a print screen with the settings for the Virtual machine created under ESXI. I updated to 13.04 in April - no trouble there. 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. Try disconnecting any drives that don't contain an operating system." dpkg: With this, you can repair broken software packages. So that works. So the OS won't boot if you haven't plugged in your USB. Failed software installations or updates can cause problems with Ubuntu not starting. If you need more, you can use the Discover Software Center to download the required app that suits your needs, for free. : This is the file system check tool, which scans the hard disk drive and repairs any errors it finds. If I enable the third option (see pic), then I can boot the CD in UEFI mode. 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. Click Start to check the hard disk.. 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. Re: Operating System Not Found Post by majpooper » Thu Jan 28, 2016 3:33 am I jad this problem a long time ago - it turned out it was the boot order in the bios. Operating system not found. Using USB to ISO, I put Ubuntu 12.04 i386 on my USB and then connected it to another machine. 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