Only load ubuntu bootloader sometimes
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How to set Windows bootloader as default bootloader?
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How to boot to the recovery mode if it is not listed in Grub?
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How to fix very slow Ubuntu booting?
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How to get to the GRUB menu at boot-time?
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Slow boot issue due to plymouth-quit-wait.service + ubuntu 18.04
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How to enable numlock at boot time for login screen?
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How do I troubleshoot random rebooting?
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Windows Boot Manager: Make Ubuntu the default instead of Windows
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auto start or enable service on boot up permanently ubuntu 16.04 lts
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What is a boot loader, and how would I develop one?
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Change boot order using efibootmgr
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How do I disable X at boot time so that the system boots in text mode?
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Remove GRUB Loader
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Where is the boot loader installed?
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How can you schedule a computer to boot at a specific time?
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One click shutdown Ubuntu and load into alternative bootup
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Stop programs from starting up automatically on boot on Windows