Thanks for reporting this issue, I have tried to reproduce it locally on a couple machines with the same CPUID but they boot fine with this microcode revision - from their dmesg:
microcode: microcode updated early to revision 0xe2, date = 2020-07-14 Linux version 5.4.0-54-generic (buildd@lcy01-amd64-024) (gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)) #60-Ubuntu SMP Fri Nov 6 10:37:59 UTC 2020 (Ubuntu 5.4.0-54.60-generic 5.4.65) ... microcode: sig=0x406e3, pf=0x80, revision=0xe2 microcode: Microcode Update Driver: v2.2. (Although these have a different CPU than the one listed above - Intel(R) Core(TM) i7-6500U) So I am not able to reproduce it myself which makes this hard to try and debug. I do notice you mention the machine has BIOS update available - can you please try installing this first and see if that helps? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1904658 Title: intel-ucode sig=0x406e3 from release 3.20201110.0ubuntu0.20.04.2 hangs system in early boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/intel-microcode/+bug/1904658/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
