I can report a very similar experience after the update to kernel *-24.
The difference with my machine - a barebook Clevo packaged by Pioneer Computers 
Australia -
is that no keyboarding, usb mouse, or touchpad use reproducably reduces the 
hang time by plymouth to less than an average 90seconds.  The appearance of the 
cursor is fairly unpredictable within those times and at a rare few boots, 
CTRL+ALT F2 sent the system into a wobbly dance between the shell and plymouth.
Holding SHIFT during boot however does produce an acceptable and reproducable 
boot into Xorg time of about 15s.
Installing and enabling haveged in sysctrl has the same effect as holding the 
SHIFT key.
Booting into the *-23 kernel removes the hang and any of the wobbly moves 
between shell and plymouth.

As requested, after uninstalling haveged and booting to *-24 kernel, both using 
the SHIFT workaround and the longer playing with keyboard and pointers, issuing 
the command:
lsof | grep /dev/random

listed nothing.

Interesting that with sudo prefixed, the command complains:

'lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/1000/gvfs
      Output information may be incomplete.'
While it doesn't complain when the user themself issues the command.
Is this a bug too, or is it logical that the virtual gnome file system is 
indeed run per user
and not by root?

Neither forms of the command list anything.

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  Ubuntu 18.04:  gdm3 does not switch to graphics after update

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