After 18.04 Installation TPM error screen (read a pcr value)

I installed a fresh (daily build, 20.04.2018) Ubuntu 18.04 on an Dell XPS 13.
After the installation was complete, it didn't shut down successfully:

[....] tpm tpm0: A TPM error (7) occurred attempting to read a pcr value
[....] tpm tpm0: A TPM error (7) occurred attempting to read a pcr value
[....] sd 8:0:0:0: [sda] No Caching mode page found
[....] sd 8:0:0:0: [sda] Assuming drive cache: write through

=> After waiting a couple of minutes, I killed the system and restarted it manually.
Everything seems to work thus far, the LVM decryption worked, too.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: debian-installer (not installed)
ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
Uname: Linux 4.15.0-15-generic x86_64
ApportVersion: 2.20.9-0ubuntu6
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 21 13:02:19 2018
InstallationDate: Installed on 2018-04-21 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180420)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 0bda:5682 Realtek Semiconductor Corp.
 Bus 001 Device 002: ID 0a5c:6412 Broadcom Corp.
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. XPS 13 9350
MemoryUsage:
 total used free shared buff/cache available
 Mem: 16268064 1549300 12276884 830220 2441880 13784500
 Swap: 1003516 0 1003516
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-15-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
SourcePackage: debian-installer
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/14/2017
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.6.1
dmi.board.name: 0VM5NC
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.6.1:bd12/14/2017:svnDellInc.:pnXPS139350:pvr:rvnDellInc.:rn0VM5NC:rvrA01:cvnDellInc.:ct9:cvr:
dmi.product.family: NULL
dmi.product.name: XPS 13 9350
dmi.sys.vendor: Dell Inc.