Tente o reparo de inicialização a partir de um CD ao vivo ou mídia USB ativa.
Aqui estão as instruções: Como instalar a ferramenta Boot-Repair em um disco ao vivo do Ubuntu?
- Insert or connect the Ubuntu live media (DVD or USB).
Find out how to boot your computer from removable media.
Note that there is a difference between booting of older computers (BIOS/MBR) and newer ones designed for Windows 8 and later releases (UEFI/GPT).
Reboot the computer from live media and choose Try Ubuntu when asked.
Connect to the internet, then open a terminal with Ctrl+Alt+t, paste the following commands and run them by pressing Enter:
sudo add-apt-repository -y ppa:yannubuntu/boot-repair; \ sudo apt-get update; \ sudo apt-get install -y boot-repair && boot-repair
Note: You copy and run them all at once. If you want to run them individually just remove the trailing "
; \
".É isso aí, a janela Boot-Repair aparecerá!