Public bug reported:

When lvm snapshot exists on any of the volume groups, ubuntu will hang
while booting and after a while display systemd-udevd:240 blocked for
more than 120 seconds; lvm:50 blocked for more than 120 seconds. At this
point, hard reset is required. Once every 5 or 6 resets it will boot

Removing a snapshot makes it boot without issues every time.

uname -a: 4.13.0-38-generic #43-Ubuntu SMP Wed Mar 14 15:20:44 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux ---> but tested also on 4.13.0-37
grub-efi-amd64 2.02~beta3-4ubuntu7.3
lvm2 2.02.168-2ubuntu3
systemd 234-2ubuntu12.3

 affects ubuntu

** Affects: ubuntu
     Importance: Undecided
         Status: New

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  Ubuntu will boot once every 5 or 6 times when lvm snapshot exists

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