I found the problem.
The culprit is the packet grub2-theme-mint. Last version 1.2.2
When I remove this packet grub initrd works fine with the new kernels.
Sorry for the misplaced bug report.
** Changed in: linux (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1975690
Title:
kernel 5.13.0-41 and 5.13.0-44 do not boot
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