Public bug reported:

Hello,

On HP laptop model 15-AC106NQ running Xubuntu 18.04 LTS I have upgraded
the kernel from linux-image-4.15.0-23-generic 4.15.0-23.25 AMD64 Signed
to the new kernel linux-image-4.15.0-24-generic 4.15.0-24.26 AMD64
Signed.

After this, the computer boots to blank screen and is freezing. If I
push random keys multiple times or if I keep switching between ttys, the
computer shows after one minute the Xubuntu login screen. If I chose
from the Grub menu the old linux-image-4.15.0-23-generic kernel, the
computer boots very fast directly into graphic mode as it should. I was
able to successfully use all the old Ubuntu/Xubuntu LTS versions on this
HP laptop.

Thank you.

** Affects: linux-signed (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1780976

Title:
  After upgrading to linux-image-4.15.0-24-generic, Xubuntu 18.04 LTS
  boots to blank screen

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