Package 'grub-персональный компьютер' ты существуешь не installation candidate

гm trying to make в двойственный boot with Windows/Ubuntu, but after I installed Убунту I can't boot from USB anymore!

гm trying to использовал Boot-Repair, but the problem is it asks я to run в command that refers to в package with не installation candidate!

Here is the command with the ошибка:

sudo apt-get install -y --force-yes grub-pc linux-generic
Package 'grub-pc' has no installation candidate