Ubuntu – Remove Ubuntu from dual-boot system

15.10bootdual-bootuefiwindows

I had Ubuntu 15.10 and Windows 10 on the same drive. I wanted to remove Ubuntu so I did following steps:

go to disk manager and remove two Ubuntu partitions and add free space to windows partition.
run Windows USB installer with command line ant type: bootrec.exe /fixmbr

The thing is that Ubuntu boot options were not removed from my BIOS. I had to manually switch it to Windows boot because the computer was starting with a GRUB command line.

Is there a way to safely remove these bot options?

Best Answer

With the new EFI system the windows and Linux bootmanager are separated. To use the windows boot manager as the default one instead of grub, just select it as the default EFI boot manager in the BIOS settings and you'll automatically boot into Windows by default

Related Solutions

Ubuntu – How to remove Windows 7 from the dual boot system with Ubuntu

These instructions are only valid if you're not using a Wubi installation

Start a disk manager (GParted or Gnome Partition Manager will be fine)
Select the Windows partition (be sure to select the right one!, if you're selecting a partition with the ext* filesystem, you're wrong. A partition with the NTFS filesystem is more likely to be your windows partition)
Remove the windows partition
Windows 7 installs its bootloader to a 100MB partition, the first one. If this partition exists, remove it.
Create a new partition for your data and format it with the ext4 filesystem
If you're using Gnome Partition Manager, you will be offered to take the ownership of the partition. Otherwise, close the partition manager, mount the partition, open a terminal and run:
```
sudo chown "$USER": /media/name-of-your-partition
```
Since the windows partition is missing, GRUB's OS prober won't find it when detecting OSes. To remove the windows boot entry, open a terminal and run:
```
sudo update-grub
```
This assumes that GRUB is your bootloader which is always the case if you installed Ubuntu after windows 7.

If you've previously configured Ubuntu to auto-mount your Windows partition, you need to remove that. Edit the /etc/fstab file as root and remove the line regarding windows. Beware that you do not remove other lines as it may render your system unbootable which can be recovered with a Live CD only! Such a line may look like:

/dev/sda2 /media/windows fuseblk rw,nosuid,nodev,allow_other,blksize=4096 0 0

Best Answer

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Ubuntu – How to remove Windows 7 from the dual boot system with Ubuntu

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