5.To install VirtualBox, click on the setup then hit next and next. Do diskutil umount force /Volumes/Macintosh HD/ Take note of your disk id. Close Disk Utility and go to the command line terminal. Go to Disk Utility and mount your Mac volume. Boot to internet recovery or a USB drive with the High Sierra Installer (standard Sierra recovery mode won't do).
Sierra Unable To Unmount Volume For Repair Mac OS X ElThe Mac won't start problem has been occurred on Mac OS X El Capitan and macOS Sierra as well before. MacOS High Sierra Won't Start. You should try each, one at a time, then test to see if the problem is fixed before going on to the next.4. Open the VirtualBox then tap on New at the upper left-hand side and name the Virtual Machine OS X El Capitan. Now, you have to create a new Virtual Machine.Select the indented (usually, Macintosh HD) volume entry from the side list. Choose Disk Utility and click on the Continue button. Immediately after the chime hold down the Command and R keys until the Utility Menu appears. Repair the disk by booting from the Recovery HD. This is slower than a standard startup. Start the computer in Safe Mode, then restart normally.Create a New User Account Open Users & Groups preferences. Restart the computer from the Apple Menu. Quit Disk Utility and return to the Utility Menu. Wait for the Done button to appear. Mac set default program for file typeReinstall OS X by booting from the Recovery HD using the Command and R keys. If your problems cease, then consider switching to the new account and transferring your files to it - Transferring files from one User Account to another. Upon completion log out of your current account then log into the new account. Setup a new Admin user account. On the left under Current User click on the Add button below Login Options. When Disk Utility loads select the drive (out-dented entry) from the Device list. Select Disk Utility from the Utility Menu and click on Continue button. When the Utility Menu appears: Immediately after the chime hold down the Commandand Rkeys until the Apple logo appears. Erase and Install OS X Restart the computer. Select Install OS X and click on the Continue button. Quit Disk Utility and return to the Utility Menu. Click on the Apply button, then wait for the Done button to activate and click on it. Set the Format type to Mac OS Extended (Journaled.)
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