Initramfs unpacking failed: invalid magic as start of compressed

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There are two solutions:

  1. solution: Switch to Kernel 5.10 or newer LTS in GRUB menu

OR

  1. solution: You need to chroot to your broken system with live USB stick, then edit /etc/mkinitpcio.conf to change the compression to gzip, then run mkinitcpio -P && update-grub, then reboot
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Notebook does not boot after last update (kernel 5.4)