Hi! update-grub does not only exit with status code 1 without noticing the user, one should point out that currently it's not possible to install a new kernel with an unpatched update-grub. Installing a new kernel, uninstalling the running one and rebooting will even result in an "unbootable" system, as grub will only show the old kernel entry in its menu, although the output of update-grub looks fine to the user.
Greetings, Gunter
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