Feedback on the Lenovo ThinkPad T470s - Thorpe2

Hello Ubuntu Team,

unfortunately I am unable to install Ubuntu 18.04 on a Lenovo T470s.

I tried to make a bootable USB image with Ubuntu using the program "Startup Disk".
The image boots fine, but while copying files to the hard disk the installer crashes.

After that I created a bootable USB with Rufus.
Same problem here.

The windows partition is encrypted and secure boot is on.
The ext4 partition and the swap partition was created.
But the installation crashes while copying files to the SSD.

How to fix this?

Best regards

Thorsten