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OS: Ubuntu 18.04 LTS, with Linux 4.15.0-1087-oem.

Notebook model: DELL LATITUDE 7400. No discrete video card.

The problem appeared suddenly and recently, probably after a system update. First, the loader window appears, I press Enter on the Ubuntu item - the download does not go, but sometimes it loaded without problems. I did all the manipulations with the parameters: neither nomodeset nor others help. Now it doesn't start at all. All loader parameters are in their original state.

During these "black screens" the notebook starts to get very warm.

Edited the loader configuration file /etc/default/grub:

#GRUB_DEFAULT=0
GRUB_DEFAULT="1>2"

Updated the loader. Checking information about the current kernel (kernel release):

$ uname -r
4.15.0-1080-oem

So now 4.15.0-1080-oem is loaded by default. But that's half the case. There is some serious problem with the latest boot-loaders (4.15.0-1087-oem & 4.15.0-1081-oem) - an obvious bug, there are fresh posts about it in the web... And how to solve this problem?

Maybe you just need to wait for the error to be fixed, and don't update the system until then?

BeastOfCaerbannog
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eeigor
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2 Answers2

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I had similar problems with Ubuntu 18.04 LTS on Notebook model: DELL LATITUDE 7400 The black screen was (violet'ish color of grub)

I can boot either with linux 4.15.0-1087-oem or 4.15.0-1081-oem but only when I boot up from the power button.

But hangs if I power up from plugin AC or USB-C Dock cable or if I use software reboot.

So I uncheck in the BIOS the options "Wake on Dell USB-C Dock" and "Wake on AC" in "Power Management" section. And try not to use reboot with software command but use the power button.

I thinks the issue is with Grub 2.02. I modified /etc/default/grub with the following:

GRUB_DEFAULT="1>0"
GRUB_TIMEOUT_STYLE=menu
...
GRUB_TIMEOUT=30
GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_CMDLINE_LINUX=""

So now when I reboot(with software command) it display indefinitely "loading kernel 4.15.0-1087-oem"

But I can boot when I power up my laptop using the power button (with plugin AC or USB-C Dock cable) and selecting manually kernel 4.15.0-1087-oem in grub menu.

it seems the auto selection of kernel in grub 2.02 doesn't work well on dell latitude 7400 laptops!

G.T
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I finally got it to work even without plugin AC cable or by restarting ubuntu with this post:

Ubuntu 18.04 fails to boot even in recovery mode (stuck on loading initial ram disk) on ASUS UX433FA

You need to add dis_ucode_ldr to in /etc/default/grub

sudo gedit /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="splash dis_ucode_ldr"

Then :

sudo update-grub

And get the specific version of intel-microcode:

sudo apt install intel-microcode=3.20180312.0~ubuntu18.04.1

Since this bug didn't showed up the fresh install of my laptop I guess the intel-microcode update did introduce it!

AEM
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G.T
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