How to properly enable hibernation on Ubuntu 24.04 using a swap file

Ubuntu 24.04 LTS introduced silent changes to its polkit permissions system, breaking most existing hibernation tutorials that rely on the outdated .pkla file format. The correct setup requires passing resume and resume_offset parameters directly through GRUB, pointing to the swap file's UUID and physical offset on disk. A common initramfs warning is triggered when a separate resume config file is created unnecessarily, as the kernel already reads the required parameters from GRUB. Additionally, legacy init scripts that attempt to manually write to kernel power management interfaces will cause a 'write error: invalid argument' failure and should be removed. The guide also notes that polkit rules must now be written in JavaScript .rules format, as the old .pkla format is silently ignored on Ubuntu 24.04.