This bug was fixed in the package linux - 4.18.0-15.16

---------------
linux (4.18.0-15.16) cosmic; urgency=medium

  * Ubuntu boot failure. 4.18.0-14 boot stalls. (does not boot) (LP: #1814555)
    - Revert "drm/i915/ringbuffer: Delay after EMIT_INVALIDATE for gen4/gen5"

  * Userspace break as a result of missing patch backport (LP: #1813873)
    - tty: Don't hold ldisc lock in tty_reopen() if ldisc present

 -- Stefan Bader <stefan.ba...@canonical.com>  Thu, 07 Feb 2019 11:24:34
+0100

** Changed in: linux (Ubuntu Cosmic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1814555

Title:
  Ubuntu boot failure. 4.18.0-14 boot stalls. (does not boot)

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Cosmic:
  Fix Released

Bug description:
  Today my Ubuntu (18.10) did an auto-upgrade to 4.18.0-14-generic,
  requested a reboot, and was unable to boot. After the "Starting
  Load/Save RF Kill Switch Status..." line it is waiting forever.
  (Or/and doing something behind the scenes. After a while, even the HDD
  indicator led go out.)

  This is a permanent error, so kernel 4.18.0-14 does NOT boot.
  I was able to boot with kernel 4.18.0-13. (By pressing Shift when grub 
starts.)

  My configuration is "nothing fancy", possibly-except the locale (ISO-8859-2, 
hu and en), Xcfe4, gdm3, gnome-screensaver.
  I have already upgraded to the latest packages. (sudo apt-get dist-upgrade)

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