Fix Ubuntu 18.10 on Dell XPS 9570

fix-ubuntu-18.10-on-dell-xps-9570

#
# Run this from the Live USB.
#

#############################
# EDIT YOUR PARTITIONS HERE #
#############################
root_partition=/dev/nvm0n1p2

sudo mount ${root_partition} /mnt

sudo mount --bind /dev /mnt/dev
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys /mnt/sys 
sudo mount --bind /usr/ /mnt/usr

# Enable internet on chroot
sudo ln -s /etc/resolv.conf /mnt/etc/resolv.conf

sudo chroot /mnt

#
# INSIDE THE CROOT
#

sudo apt update
sudo apt upgrade
sudo apt install intel-microcode
sudo apt install nvidia-driver-390

# UPDATE KERNEL
# http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D
cd /tmp
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19-rc8/linux-headers-4.19.0-041900rc8_4.19.0-041900rc8.201810150631_all.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19-rc8/linux-headers-4.19.0-041900rc8-generic_4.19.0-041900rc8.201810150631_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19-rc8/linux-headers-4.19.0-041900rc8-lowlatency_4.19.0-041900rc8.201810150631_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19-rc8/linux-image-unsigned-4.19.0-041900rc8-generic_4.19.0-041900rc8.201810150631_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19-rc8/linux-image-unsigned-4.19.0-041900rc8-lowlatency_4.19.0-041900rc8.201810150631_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19-rc8/linux-modules-4.19.0-041900rc8-generic_4.19.0-041900rc8.201810150631_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19-rc8/linux-modules-4.19.0-041900rc8-lowlatency_4.19.0-041900rc8.201810150631_amd64.deb
dpkg -i *.deb

# FIX INTEL i915
echo "options i915 enable_psr=0" > /etc/modprobe.d/i915.conf 

exit
reboot

Hello. Can some one help me with instruction? Who can explain me what means "Run this from the Live USB." ? I should run this when Ubuntu is already installed? And where I can change this "root_partition=/dev/nvm0n1p2" ?
Thank you!