What is the error when installing Kubuntu?

Question

linux

I'm trying to install Kubuntu from a bootable flash drive, first the Kubuntu logo lights up for a few seconds, and then this appears:
[ 9.822846] nouveau 0000:01:00.0: bus: MMIO write of ffffff1f FAULT at 603l13d4 [IBUS]
[ 9.822854] nouveau 0000:01:00.0 : volt: couldn't find speedo value, volting not possible
BusyBox v1.27.2 (Ubuntu 1:1.27.2-2ubuntu3) built-in shell (ash)
Enter 'help' for a list a built-in commands.
(initramfs) Unable to find a medium containing a live file system