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apparently kernel rollbacks are not a standard process, so here's what I did:

  • sudo apt-mark hold linux-image-6.12.57+deb13-amd64:amd64 to prevent old kernel being removed later
  • sudo grub-mkconfig to get a list of grub menu entries and submenus
  • sudo vim /etc/default/grub, changing GRUB_DEFAULT="Advanced options for Debian GNU/Linux>Debian GNU/Linux, with Linux 6.12.57+deb13-amd64" (yes, you have to write out the full name of the submenu and the menu item, with > between them…)
  • sudo update-grub to apply the changes to /etc/default/grub
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