Dual boot Windows + Linux

Install Linux alongside Windows without losing everything.

1. Back up your data. Also save the BitLocker recovery key if the disk is encrypted.
2. Disable fast startup in Windows (administrator):

   powercfg /h off

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3. In Windows Disk Management, right-click C: → Shrink Volume to free at least 50 GB.
4. Boot from the live USB and choose "Install alongside Windows" in the installer.
5. If Windows does not appear in GRUB:

   sudo os-prober
   sudo update-grub

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