I have the same problem with "crng init done".
My Ubuntu 18 server is running under MS server 2016 Hyper-v virtualization 
solution. 
I tried to download last image of Ubuntu via torrent and installed second VM, 
but no luck, an error still here.

Maybe my information would be helpful for problem resolving.

root@maindb-master:/home/pa# uname -r
4.15.0-33-generic 


root@maindb-master:/home/pa# systemd-analyze
Startup finished in 3min 40.384s (kernel) + 9.377s (userspace) = 3min 49.761s
graphical.target reached after 7.150s in userspace


[    3.959777] hid 0006:045E:0621.0001: input: <UNKNOWN> HID v0.01 Mouse 
[Microsoft Vmbus HID-compliant Mouse] on
[    3.961890] hv_utils: Heartbeat IC version 3.0
[    3.964587] hv_utils: Shutdown IC version 3.0
[    3.966292] hv_utils: TimeSync IC version 4.0
[    3.968791] hv_utils: VSS IC version 5.0
[    4.204137] psmouse serio1: trackpoint: failed to get extended button data, 
assuming 3 buttons
[    8.497068] psmouse serio1: trackpoint: IBM TrackPoint firmware: 0x01, 
buttons: 3/3
[    8.505665] input: TPPS/2 IBM TrackPoint as 
/devices/platform/i8042/serio1/input/input3
[    8.509469] input: AT Translated Set 2 keyboard as 
/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/d34b2567-b9b6-42b9-8778-0a4ec0b955bf/serio2/inp$
[   16.428110] random: crng init done
[   16.428115] random: 7 urandom warning(s) missed due to ratelimiting
[  221.416066] raid6: sse2x1   gen()  3405 MB/s
[  221.464076] raid6: sse2x1   xor()  1938 MB/s
[  221.512035] raid6: sse2x2   gen()  3323 MB/s
[  221.562630] raid6: sse2x2   xor()  2522 MB/s
[  221.612035] raid6: sse2x4   gen()  4944 MB/s


root@maindb-master:/home/pa# systemd-analyze blame
         2.270s cloud-init-local.service
          1.564s cloud-init.service
          1.203s cloud-config.service
          1.201s dev-sda2.device
          1.066s apparmor.service
          1.013s cloud-final.service
           852ms networkd-dispatcher.service
           691ms accounts-daemon.service
           677ms snapd.service
           607ms grub-common.service
           571ms lxd-containers.service
           520ms iscsid.service
           510ms ebtables.service
           502ms systemd-journal-flush.service
           355ms apport.service
           316ms thermald.service
           304ms keyboard-setup.service
           279ms systemd-logind.service
           269ms systemd-udev-trigger.service
           267ms systemd-timesyncd.service
           253ms systemd-modules-load.service
           236ms snap-core-4486.mount
           210ms systemd-resolved.service
           204ms ufw.service
           201ms rsyslog.service
           196ms sys-kernel-debug.mount
           193ms systemd-remount-fs.service
           193ms dev-mqueue.mount
           181ms polkit.service
           180ms ssh.service
           159ms [email protected]
           154ms lvm2-monitor.service
           137ms setvtrgb.service
           136ms console-setup.service
           133ms plymouth-read-write.service
           129ms systemd-journald.service
           123ms blk-availability.service
           118ms systemd-sysctl.service
           116ms systemd-user-sessions.service


And there are other similar problems:
https://forum.manjaro.org/t/testing-update-2018-04-30-kernels-trizen-compiz/46125/9
https://forum.manjaro.org/t/boot-delay-random-crng-init-done/47182/3
https://forum.mxlinux.org/viewtopic.php?t=45498
https://unix.stackexchange.com/questions/442698/when-i-log-in-it-hangs-until-crng-init-done
https://ubuntuforums.org/showthread.php?t=2390618

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https://bugs.launchpad.net/bugs/1767782

Title:
  Xubuntu 18.04 : delay during boot - waiting for resume device -
  message : random: crng init

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