وقتي كامپیوترو روشن میکنم یه همچین صفحه ای میاد الان چند روزه اینجوری شده خواهشا راهنمایی کنید
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sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update
sudo apt-get install -y boot-repair && boot-repair
The Boot Repair window will appear after you run the boot-repair command. After it scans your system, click the Recommended repair button to repair GRUB2 with a single click.
You can also click the Advanced options header to customize GRUB2’s options without learning its command-line syntax.
Restart your computer after using the Boot Repair tool. Ubuntu should boot up normally.
sudo update-grub