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As Nvidia driver can not work properly with kernel 5.4, I have to downgrade my hwe kernel on Ubuntu 18.04 to kernel 5.3 by editing the file /etc/default/grub and do upgrade-grub. However, after I reboot with kernel 5.3, the system freeze at the DELL logo screen (I am using a Dell workstation with dual system, windows 10 and Ubuntu 18.04).

Does anyone know how to deal with this kind of problem? Any help would be highly appreciated!

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if your system freezes at the DELL logo, that is presumably before the bootloader (grub) even gets to load your kernel, i.e. you might have misconfigured your grub.

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    Hi, thanks a bunch for your prompt response! Actually I have just followed this instruction here link, comment out GRUB_DEFAULT=0 in /etc/default/grub and add a new line GRUB_DEFAULT='gnulinux-advanced-6ab014ae-b403-4d05-8444-b8061fa6b31b>gnulinux-5.3.0-62-generic-advanced-6ab014ae-b403-4d05-8444-b8061fa6b31b' based on what I got using grep gnulinux /boot/grub/grub.cfg, after that I update-grub and reboot. – Janine Jul 25 '20 at 5:11
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    I have restored the /etc/default/grub back to original with GRUB_DEFAULT=0, and restored my nvidia drive to nouveau. This time I can boot with 5.3.0-62-generic listed by Advanced options for Ubuntu. However, after I reinstall Nvidia driver 435, the system refuse to boot with 5.3.0-62-generic again. Really have no idea what can I do to fix the Nvidia driver vs kernel version issue... – Janine Jul 25 '20 at 5:53
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Eventually, I installed nvidia-driver-440 instead of 435, and the Nvidia driver vs kernel version issue can be finally settled without the need to downgrade the kernel version.

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