I also investigated this. I took these steps on a machine that hung on boot:
* Append `systemd.debug-shell=1` to the kernel command line in GRUB
* Boot and wait until the system hangs
* Switch to the debug shell via Ctrl-Alt-F9
* Run `systemctl list-jobs`
This showed that kdump-tools.service was running and all other services
needed for basic.target were waiting. Since I didn't see kdump-
tools.service making any progress, I simply stopped it via `systemctl
stop kdump-tools.service`, and the system immediately continued booting.
As a workaround, I disabled kdump-tools.service on all of my systems and
can now boot 6.17.0-6 without any other changes on all of them.
I didn't yet have time to investigate further. But at least on my
systems it seems that the real problem is not the kernel (by itself),
but that in some circumstances kdump-tools.service has an issue and
blocks the system from booting.
** Also affects: kdump-tools (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2129972
Title:
Ubuntu 25.10 can't boot with 6.17.0-6-generic kernel on encrypted fs
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