Freeze on "Loading initial ramdisk" on 21.04 (kernel 5.11)

[MilkBoy]

CPU:
Vendor ID: GenuineIntel
CPU family: 6
Model: 94
Model name: Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz
Stepping: 3

Microcode:
intel-microcode 3.20201110.0ubuntu1

won't boot at all. Tried proposed updates, but same result; stuck on loading initrd

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package:
ProcVersionSignature: Ubuntu 5.8.0-50.56-generic 5.8.18
Uname: Linux 5.8.0-50-generic x86_64
ApportVersion: 2.20.11-0ubuntu65
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 17 15:40:20 2021
UpgradeStatus: Upgraded to hirsute on 2021-04-17 (0 days ago)

[MilkBoy (michael-wikberg)]

So, after installing/removing kernels several times, now linux-image-5.11.0-16-generic manages to boot up correctly, even though there seems to be a random 5-20 second longer wait before asking for disk encryption password (compared to 20.10 with 5.8 kernels). I so have no idea what's going on here :D

[Kurazs Iosif Daniel (kjdro)]

Hello,
 I can also confirm, starting from 2021-May-10 my Ubuntu 20.04 installations wasn't booting. From what i think might be the root cause, is some security update that went in the day before that might have updated something. All i know the next day no matter what kernel version i was choosing the boot always hanged after initrd command. No matter what i was doing i could not get more logs to be prompted.
At one point i managed to reinstall grub, then proceeded to an apt upgrade, which broke my system again, and now i cant fix it by reinstalling grub.

My setup:
2 ssd's the boot and efi partitions are ext2
then i have 2 other partitions both encrypted, that share a vgroup where my root, home, swap partitions are.

I suspect that the problem comes from insufficient testing with encrypted setups.

[Paul White (paulw2u)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. We are sorry that we do not always have the capacity to review all reported bugs in a timely manner.

Ubuntu 21.04 (hirsute) reached end-of-life on January 20, 2022.

I'm setting the status of this bug to 'Incomplete' as it's not seen any activity for some time. If this is still an issue when using a currently maintained release of Ubuntu then please let us know which one(s) otherwise this bug report can be left to expire in approximately 60 days time.