HP Mini 600 G4 isn’t detecting the Ubuntu installation after reboot.

It sounds like your HP Mini 600 G4 isn’t detecting the Ubuntu installation after reboot — a common issue that can happen due to:

1. UEFI vs Legacy Boot Mode mismatch, or
2. Bootloader (GRUB) not properly installed, or
3. Drive not set as bootable, or
4. Drive encryption or unusual partitioning left over from Windows 11, especially BitLocker.

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✅ Immediate Diagnostic Steps

1. Check Boot Mode in BIOS

• Power on the machine and press Esc, then F10 to enter BIOS.
• Navigate to Boot Options.
• Confirm that:
  • UEFI Boot Mode is enabled (most Ubuntu installs default to UEFI now).
  • The drive with Ubuntu installed is listed and prioritized.
  • Secure Boot is off for troubleshooting (can be turned on again later).

2. Boot From Live USB Again

Use your Ubuntu installer USB and:

• Boot into Try Ubuntu.
• Open Disks or GParted:
  • Check that the internal drive has a proper Linux partition (e.g., ext4) and possibly an EFI System Partition (/boot/efi, FAT32).
  • Mount your Ubuntu root partition and check for /boot and /boot/efi.

3. Reinstall GRUB Bootloader (likely needed)

Open Terminal in live session:

Identify your Linux root partition:

sudo fdisk -l

Look for something like /dev/nvme0n1p3 or /dev/sda3 with Linux filesystem.

Mount and chroot into installed system:

sudo mount /dev/sdX# /mnt  # Replace with your Ubuntu root
sudo mount --bind /dev /mnt/dev
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys /mnt/sys
sudo chroot /mnt

If you have a separate EFI partition (FAT32, ~100–500 MB):

mount /dev/sdX# /boot/efi  # Replace with EFI partition

Reinstall GRUB:

grub-install
update-grub
exit

Then unmount and reboot:

sudo umount /mnt/dev /mnt/proc /mnt/sys /mnt/boot/efi
sudo umount /mnt
sudo reboot

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💡 Tips

• If Ubuntu still doesn’t boot, try Boot Repair:
  1. Boot from Live USB.
  2. Open Terminal:sudo add-apt-repository ppa:yannubuntu/boot-repair sudo apt update sudo apt install -y boot-repair boot-repair
  3. Use the Recommended Repair option.
• If your drive is NVMe and the BIOS is not listing it as a bootable option, try disabling Fast Boot, Secure Boot, and double-check UEFI settings.

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