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After successful installation of the Ubuntu 16.04 on a new Asus laptop(with Nvidia GeForce graphic card) I was asked to install software updates. The update went successfully and it asked to reboot the system.

Now I can not boot to the system. There so many content about this issue online, but it all relies on the terminal and I can't access it. In fact, this is my biggest problem.

The GRUB menu is there, I can modify the boot command, add nomodeset, remove quiet splash, add nouveau.modeset=0 or nvidia.modeset=0 - but nothing of this helps. I still see the frozen dark purple screen as soon as I hit Ctrl+X. Recovery mode doesn't help either. Tried with all these params as well. The only difference recovery mode makes - I will see these two lines before it hangs:

Loading Linux 4.15.0-58-generic ...
Loading initial ramdisk ...

I tried installing Ubuntu 18 first, run into the same issue. Thought falling back to 16 may help.

UPDATE: managed to log in by adding dis_ucode_ldr option. But have no idea what to do next.

Serhiy
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    If this command works for you than you will want to make it permanent in grub. See https://askubuntu.com/questions/281119/how-do-you-run-update-grub – Michal Przybylowicz Sep 01 '19 at 06:36

2 Answers2

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Fixed by upgrading to Ubuntu 18 and then downgrading the intel-microcode package to the previous version using this instruction:

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

Then freeze the package to avoid accidental upgrade:

sudo su 
echo "intel-microcode" hold | dpkg --set-selections

Maybe some similar solution can fix the issue on Ubuntu 16 I just didn't find the right package version to downgrade to.

Serhiy
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Here is a complete video about this problem, actually for an Asus Zenbook: https://www.youtube.com/watch?v=NbxrSaclKRc

Summary of the fix:

add the boot parameter: dis_ucode_ldr to /etc/default/grub then: update-grub

More info here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1829620

Arynor
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