system halt during installation with NV graphics card.

I check, it seems it is stuck at "GET ubiquity/install_oem".
Can you check /var/cache/debconf/config.dat, if the ubiquity/install_oem value is True.

it is in /usr/share/ubiquity/simple-plugins script, it set the db to true and get it directly in the script.

Please confirm your installation step stuck at this point.

The packages authentication should be overridden which is not.

Oct 17 07:10:59 ubuntu ubiquity: WARNING: The following packages cannot be authenticated!
Oct 17 07:10:59 ubuntu ubiquity: gcc-12-base libgcc-s1 libgomp1 libstdc++6 libc6 zlib1g libcom-err2 libssl3
Oct 17 07:10:59 ubuntu ubiquity: libtirpc-common libtirpc3 binutils-common libbinutils libctf-nobfd0 libctf0
Oct 17 07:10:59 ubuntu ubiquity: binutils-x86-64-linux-gnu binutils gcc-12-base:i386 krb5-locales
Oct 17 07:10:59 ubuntu ubiquity: libgcc-s1:i386 libcrypt1:i386 libc6:i386 libmd0:i386 libbsd0:i386
Oct 17 07:10:59 ubuntu ubiquity: libcom-err2:i386 libegl-mesa0 libgbm1 libxml2 libllvm13 libgl1-mesa-dri
Oct 17 07:10:59 ubuntu ubiquity: libglx-mesa0 libglapi-mesa libwayland-client0 libkrb5support0:i386
Oct 17 07:10:59 ubuntu ubiquity: libk5crypto3:i386 libkeyutils1:i386 libssl3:i386 libkrb5-3:i386
Oct 17 07:10:59 ubuntu ubiquity: libgssapi-krb5-2:i386 libunistring2:i386 libidn2-0:i386 libtirpc3:i386
Oct 17 07:10:59 ubuntu ubiquity: libnsl2:i386 libnss-nis:i386 libnss-nisplus:i386 libnvidia-cfg1-515
Oct 17 07:10:59 ubuntu ubiquity: libnvidia-common-515 libnvidia-compute-515 libnvidia-compute-515:i386
Oct 17 07:10:59 ubuntu ubiquity: libxau6:i386 libxdmcp6:i386 libxcb1:i386 libx11-6:i386 libxext6:i386
Oct 17 07:10:59 ubuntu ubiquity: libnvidia-decode-515:i386 libnvidia-decode-515 libnvidia-egl-wayland1
Oct 17 07:10:59 ubuntu ubiquity: libnvidia-encode-515 libnvidia-encode-515:i386 libnvidia-extra-515
Oct 17 07:10:59 ubuntu ubiquity: libnvidia-fbc1-515 libnvidia-gl-515 libnvidia-gl-515:i386 libvdpau1
Oct 17 07:10:59 ubuntu ubiquity: libxnvctrl0 linux-signatures-nvidia-5.17.0-1018-oem
Oct 17 07:10:59 ubuntu ubiquity: linux-objects-nvidia-515-5.17.0-1018-oem nvidia-kernel-common-515
Oct 17 07:10:59 ubuntu ubiquity: linux-modules-nvidia-515-5.17.0-1018-oem linux-modules-nvidia-515-oem-22.04a
Oct 17 07:10:59 ubuntu ubiquity: mesa-vdpau-drivers mesa-vulkan-drivers nvidia-compute-utils-515
Oct 17 07:10:59 ubuntu ubiquity: nvidia-kernel-source-515 nvidia-utils-515 xserver-xorg-video-nvidia-515
Oct 17 07:10:59 ubuntu ubiquity: nvidia-driver-515 nvidia-prime pkg-config screen-resolution-extra
Oct 17 07:10:59 ubuntu ubiquity: nvidia-settings oem-somerville-davos-rpl-meta vdpau-driver-all

actually it is log from apt, not ubiquity, it is ubiquity to utilize apt to do package installation.

Originally, the authentication should be omit directly, which we can see the log
"Authentication warning overridden", however, I didn't see it in your environment, so the procedure stuck.