Ubuntu – Asus zenbook 15 (UX-533FD) boot very randomly ubuntu 19.04

19.04asusbootgrub2

Since I've installed kubuntu 19.04 my computer is not able to boot all the time. I thinked it was a grub option because some things are changed from the previous version 18.04 (which works fine for me), but in fact I can make nomodeset [nouveau/nvidia].modeset=0 or many other strange things, my computer just get stuck on black screen once in five.
By the way, it makes the same trouble with the installation media

And if I press the esc key on boot, it just stay black and doesn't change anything …

config of my pc : i7 8650U + gtx 1050m

(Please correct me if my english is bad and you want to help me 😉 )

• In GRUB, press e to edit the linux startup command line and add dis_ucode_ldr at the end of the line that starts with linux /boot/... so that the line will look something like:

linux    /boot/vmlinuz-4.18.0-20-generic root=UUID=63771674-8044-4df4-\
b700-17bcc857432d ro quiet splash \$vt_handoff dis_ucode_ldr


and you'll be able to boot.

(Remove quiet splash if you want to check the system boot logs).

Add the same parameter dis_ucode_ldr to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash dis_ucode_ldr"


then run

update-grub


and then you should always be able to boot, as-is, so without editing the command in GRUB.

See - and if possible, subscribe to - this Ubuntu bug tracker for more information: