First of all, I do not use Ubuntu, I use Debian, but I thought it would be a 
nice input anyway, feel free to delete this if this don't help.
I had the same problem the first reboot I did after a system update to:

Linux version 4.9.0-6-amd64 (debian-ker...@lists.debian.org) (gcc
version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1) ) #1 SMP Debian 4.9.88-1
(2018-04-29)

Boot got stuck everytime at random: crng init, varying from 1min to 20min. A 
friend told me it was because the random pool was being populated everytime I 
booted and for some reason it was taking too long. I installed the havenge 
package (deb free repo) that contains an alternative algorithm to populate de 
RNG seeds. Apparently the problem is now solved, as my system is now booting in 
13s.
Hopefully this will be of some help. Anyway, if installing havenge does not 
work, you could purge it afterwards and no harm done...

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https://bugs.launchpad.net/bugs/1685794

Title:
  Boot delayed for about 90 seconds until 'random: crng init done'

Status in linux package in Ubuntu:
  Confirmed

Bug description:

  Shortened dmesg output, notice the unnaturally long delay before crng
  init finishes:

  [    8.533630] Bluetooth: hci0: Intel Bluetooth firmware patch completed and 
activated
  [    8.542239] input: HDA Intel PCH Mic as 
/devices/pci0000:00/0000:00:1b.0/sound/card1/input18
  [    8.542313] input: HDA Intel PCH Line as 
/devices/pci0000:00/0000:00:1b.0/sound/card1/input19
  [    8.542382] input: HDA Intel PCH Dock Line Out as 
/devices/pci0000:00/0000:00:1b.0/sound/card1/input20
  [    8.542449] input: HDA Intel PCH Headphone as 
/devices/pci0000:00/0000:00:1b.0/sound/card1/input21
  [    8.544240] cdc_ether 2-6:2.0 usb0: register 'cdc_ether' at 
usb-0000:00:14.0-6, CDC Ethernet Device, 02:1e:10:1f:00:00
  [    8.544271] usbcore: registered new interface driver cdc_ether
  [    8.637660] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
  [    8.654022] input: HP WMI hotkeys as /devices/virtual/input/input22
  [    8.688226] cdc_ether 2-6:2.0 enp0s20u6c2: renamed from usb0
  [    8.713288] iwlwifi 0000:02:00.0 wlo1: renamed from wlan0
  [    9.804308] input: ST LIS3LV02DL Accelerometer as 
/devices/platform/lis3lv02d/input/input23
  [   98.327857] random: crng init done
  [   98.330072] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
  [   98.330073] Bluetooth: BNEP filters: protocol multicast
  [   98.330077] Bluetooth: BNEP socket layer initialized
  [   98.443281] kauditd_printk_skb: 90 callbacks suppressed
  [   98.492927] IPv6: ADDRCONF(NETDEV_UP): enp0s25: link is not ready
  [   98.681030] IPv6: ADDRCONF(NETDEV_UP): enp0s25: link is not ready
  [   98.685672] IPv6: ADDRCONF(NETDEV_UP): enp0s20u6c2: link is not ready
  [   98.685789] cdc_ether 2-6:2.0 enp0s20u6c2: kevent 12 may have been dropped
  [   98.688384] IPv6: ADDRCONF(NETDEV_UP): wlo1: link is not ready
  [   98.690915] iwlwifi 0000:02:00.0: L1 Enabled - LTR Enabled

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: linux-image-4.10.0-19-generic 4.10.0-19.21 [modified: 
boot/vmlinuz-4.10.0-19-generic]
  ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
  Uname: Linux 4.10.0-19-generic x86_64
  ApportVersion: 2.20.4-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', 
'/dev/snd/hwC1D0', '/dev/snd/pcmC1D0c', '/dev/snd/pcmC1D0p', 
'/dev/snd/controlC1', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D8p', 
'/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/controlC0', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CurrentDesktop: Unity:Unity7
  Date: Mon Apr 24 14:58:33 2017
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2017-04-18 (5 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  MachineType: Hewlett-Packard HP EliteBook 840 G1
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-19-generic.efi.signed 
root=UUID=9fb9fc1d-15a4-4e98-a2ae-bf572e0900d5 ro quiet splash vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.10.0-19-generic N/A
   linux-backports-modules-4.10.0-19-generic  N/A
   linux-firmware                             1.164
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/23/2016
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L71 Ver. 01.37
  dmi.board.name: 198F
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 15.59
  dmi.chassis.asset.tag: USH452L0B1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvrL71Ver.01.37:bd05/23/2016:svnHewlett-Packard:pnHPEliteBook840G1:pvrA3009DD10203:rvnHewlett-Packard:rn198F:rvrKBCVersion15.59:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 840 G1
  dmi.product.version: A3009DD10203
  dmi.sys.vendor: Hewlett-Packard

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