I don't know yet if related, but I also observed the following:

syslog:May 21 17:25:27 ubuntu kernel: [    0.000000] random: get_random_bytes 
called from start_kernel+0x99/0x4fd with crng_init=0
syslog:May 21 17:25:27 ubuntu kernel: [    1.902484] random: lvm: uninitialized 
urandom read (4 bytes read)


Could the missing ttyS* have an effect on entropy ?

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https://bugs.launchpad.net/bugs/1879987

Title:
  kernel get stuck at boot if specified 'console=ttyS* ' doesn't exist.

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