The Ubuntu Release Notes, https://wiki.ubuntu.com/FocalFossa/ReleaseNotes#Installer_and_live_session, mention an issue with nouveau crashing during the installation process. You might take a look at those and see if the work around helps you out.
** Package changed: ubuntu-release-upgrader (Ubuntu) => linux (Ubuntu) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875266 Title: Installation of 20.04 fails with a kernel bug Status in linux package in Ubuntu: New Bug description: Fresh installation of Kubuntu 20.04 on an Intel i3 system. Currently it's running 18.10 without issue. The graphical installer hangs at "configuring apt 9%" Attached is output from dmesg and /proc/cpuinfo ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: ubuntu-release-upgrader-core 1:20.04.18 ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30 Uname: Linux 5.4.0-26-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 CasperMD5CheckResult: skip CrashDB: ubuntu CurrentDesktop: KDE Date: Sun Apr 26 19:15:23 2020 InstallationDate: Installed on 2017-12-15 (864 days ago) InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Release amd64 (20171017.1) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader Symptom: dist-upgrade UpgradeStatus: Upgraded to focal on 2020-04-26 (0 days ago) VarLogDistupgradeXorgFixuplog: INFO:root:/usr/bin/do-release-upgrade running DEBUG:root:creating backup '/etc/X11/xorg.conf.dist-upgrade-202004261103' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875266/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
