Tried on HP Victus The grub is lost because the windows is set as default for login in BIOS. If you set Ubuntu as default grub will be back. Go to BIOS settings (F10) and Boot Settings and OS boot manager and put ubuntu on top. You get grub back (you can select between ubuntu and windows then) Select Windows [Didn't Work]: Hold Shift+Restart After Restart Again F9 and Windows and got to: Advanced Options > Command Prompt and do: X:\Windows\System32> bootrec /fixmbr X:\Windows\System32> bootrec /fixboot sometimes this gives error: Access is denied. if so, do this X:\Windows\System32> bootsect/nt60 sys Then do: X:\Windows\System32> bootrec /fixboot Repair Grub : Do this before deleting partition [Did but didn't work] Might need to do it by creating an installation media in USB (F9) for boot options HP Victus. X:\Windows\System32> bootrec /fixmbr X:\Windows\System32> bootrec /fixboot sometimes this gives error: Access is denied. if so, do this X:\Windows\Syst...