The resposne is slow when entering Live USB in the beginning (nouveau driver is loaded)

[Betty Lin]

I used a Dell Precision 5530 (I+N) machine to install Disco 19.04 beta.

When I boot the Live USB, there was a lot of errors related to nouveau in dmesg.
The touchpad responds slow in the beginning, and needs 30 seconds to 1 min then can click the icon on the top right "Install Ubuntu 19.04"

After that, the installation can be done and successful.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: ubiquity 19.04.7
ProcVersionSignature: Ubuntu 5.0.0-7.8-generic 5.0.0
Uname: Linux 5.0.0-7-generic x86_64
ApportVersion: 2.20.10-0ubuntu23
Architecture: amd64
CasperVersion: 1.402
CurrentDesktop: ubuntu:GNOME
Date: Thu Mar 28 06:42:48 2019
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper ---
LiveMediaBuild: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190326.2)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)