Unfortunately, those don’t provide a lot of information.
If possible, please file a bug report.
That may mean repeating the install until you get to that error point.
When you see the error, use CTRL-ALT-F2 which should give you a command line prompt.
as suggested. That will save to a temporary file, and give you the name of the file. Then you will need to mount some file system where you can copy it to a more permanent place.
You can maybe plug in a USB flash drive and mount that. If you are installing from a flash drive, you probably can’t use that drive to save the logs. So try a different flash drive. After plugging in, use:
ls -l /dev/sd?
to try to recognize the drive that you just plugged in. If it is “/dev/sdb” then you could probably mount with
mount /dev/sdb1 /mnt/x
Another possibility is that there might be a partition on your hard drive that you can use to save the logs. On a UEFI box, I would try the EFI partition which usually has enough free space.
When done saving logs, umount that partition where you saved them. And then you can reboot or force power off or use CTRL-ALT-F7 to get back to graphic screen and abort the install.