Step-by-step guide to dual booting Ubuntu 26.04 LTS alongside Windows 10/11. Covers downloading the Ubuntu ISO, flashing it to a USB drive with Balena Etcher, shrinking the Windows C partition using Disk Management to free up space, configuring BIOS boot order and disabling Secure Boot, running the Ubuntu installer with manual partitioning (ext4, root mount point), setting up the GRUB bootloader, and verifying both OSes boot correctly. Also includes post-install tips like installing VLC, GIMP, LibreOffice, and Steam.

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