It should work fine and boot both systems. Sudo grub-install /dev/sda # NOTE THAT THERE IS NO DIGITĪnd restart.
Then continue with those commands: sudo apt-get update If you have UEFI and Windows 8 and above you probably need to replace grub-pc with grub-efi-amd64 in sudo apt-get install grub-pc. Note: These instructions were initially written for Windows 7 and BIOS booting computers. If you have a SEPARATE /boot partition: sudo mount /dev/DEVICENAME_FROM_STEP_ONE /boot Sudo rm -rf /boot # Careful here, make sure YOU ARE USING THE LIVE CD. If you DO NOT have a separate /boot partition: sudo mount /dev/DEVICENAME_FROM_STEP_ONE /mnt Load up from your Ubuntu live CD, and then run these commands. Note: Instead of mounting the boot directory or partition from the installation in the live media environment you can specify the path with the -boot-directory parameter for grub-install, more information on the manpage. Install Windows 7 into the space you just made Step Three – Mount /boot If that doesn't show up there, make note of the / device. If it's a partition, remove it from GRUB to make sure it doesn't break your Ubuntu install - GParted will complain if anything bad is about to happen. Open up GParted, and make sure that you have at least 20 GB available for Windows 7, either as a partition you can remove, or as unpartitioned space. Step Zero – Backup your important data before doing anything Step One – Make space for Windows
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