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I installed 18.04 LTS and it froze on the lock screen. Yesterday I tried 18.10 and this got stuck after about 20 seconds of using it.

What could be the problem, and how can I fix it?

marked as duplicate by karel, Charles Green, user68186, Elder Geek, Kulfy Feb 6 at 21:13

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There are several how-tos available for running Ubuntu on this Dell XPS 15 9560.

To get rid of the freezing add these boot parameters during boot. Access the GRUB menu and press E, then add this text to the end of the line beginning with linux:

nouveau.modeset=0 acpi_osi=Linux acpi_rev_override=1

Press F10 to boot.

Now edit the file /etc/default/grub with root permission, for example using the command

sudoedit /etc/default/grub

In the file, edit the line beginning GRUB_CMDLINE_LINUX_DEFAULT so after your edit it says:

GRUB_CMDLINE_LINUX_DEFAULT="acpi_rev_override=1 acpi_osi=Linux nouveau.modeset=0 quiet splash"

Save the file and exit, and run

sudo update-grub

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