Upgrade stops with this messages: "snapd.snap-repair.service is a disabled or a static unit, not starting it." Then Ubuntu can't be started again

[haidi]

lsb_release -rd
Description: Ubuntu 18.04 LTS
Release: 18.04

Upgrading System directly after installation.
Installation stops with this message

Setting up snapd (2.33.1+18.04)
Installing new version of config file /etc/apparmor.d/usr.lib.snapd.snap-confine.real
Installing new version of config file /etc/profile.d/apps-bin-path.sh
snapd.snap-repair.service is a disabled or a static unit, not starting it.

sudo lshw -short (if necessary)

H/W-Pfad Gerät Klasse Beschreibung
=================================================================
                                      system MS-7799 (To be filled by O.
/0 bus H81TI (MS-7799)
/0/0 memory 64KiB BIOS
/0/3d processor Intel(R) Pentium(R) CPU G32
/0/3d/3e memory 512KiB L2 Cache
/0/3d/3f memory 128KiB L1 Cache
/0/3d/40 memory 3MiB L3 Cache
/0/41 memory 8GiB Systemspeicher
/0/41/0 memory DIMMProject-Id-Version: lsh
/0/41/1 memory DIMMProject-Id-Version: lsh
/0/41/2 memory 8GiB SODIMM DDR3 Synchron 1
/0/41/3 memory DIMMProject-Id-Version: lsh
/0/100 bridge 4th Gen Core Processor DRAM
/0/100/2 display Xeon E3-1200 v3/4th Gen Cor
/0/100/3 multimedia Xeon E3-1200 v3/4th Gen Cor
/0/100/14 bus 8 Series/C220 Series Chipse
/0/100/14/0 usb3 bus xHCI Host Controller
/0/100/14/0/1 input USB Keyboard
/0/100/14/0/3 input 2.4G Wireless Mouse
/0/100/14/0/8 bus USB2.0 Hub
/0/100/14/0/8/1 bus USB2.0 Hub
/0/100/14/1 usb4 bus xHCI Host Controller
/0/100/14/1/1 bus USB3.0 Hub
/0/100/14/1/1/1 bus USB3.0 Hub
/0/100/14/1/1/3 scsi5 storage USB FLASH DRIVE
/0/100/14/1/1/3/0.0.0 /dev/sdd disk 62GB USB FLASH DRIVE
/0/100/14/1/1/3/0.0.0/0 /dev/sdd disk 62GB
/0/100/14/1/1/3/0.0.0/0/1 /dev/sdd1 volume 58GiB Windows FAT Laufwerk
/0/100/16 communication 8 Series/C220 Series Chipse
/0/100/1a bus 8 Series/C220 Series Chipse
/0/100/1a/1 usb1 bus EHCI Host Controller
/0/100/1a/1/1 bus USB-Hub
/0/100/1b multimedia 8 Series/C220 Series Chipse
/0/100/1c bridge 8 Series/C220 Series Chipse
/0/100/1c.4 bridge 8 Series/C220 Series Chipse
/0/100/1c.4/0 enp2s0 network RTL8111/8168/8411 PCI Expre
/0/100/1d bus 8 Series/C220 Series Chipse
/0/100/1d/1 usb2 bus EHCI Host Controller
/0/100/1d/1/1 bus USB-Hub
/0/100/1f bridge C220 Series Chipset Family
/0/100/1f.2 storage 8 Series/C220 Series Chipse
/0/100/1f.3 bus 8 Series/C220 Series Chipse
/0/1 scsi0 storage
/0/1/0.0.0 /dev/sda disk 120GB KINGSTON SA400S3
/0/1/0.0.0/1 /dev/sda1 volume 46GiB EXT4-Laufwerk
/0/1/0.0.0/2 /dev/sda2 volume 65GiB EXT4-Laufwerk
/0/2 scsi1 storage
/0/2/0.0.0 /dev/sdb disk 1TB ST1000LM024 HN-M
/0/2/0.0.0/1 /dev/sdb1 volume 931GiB EXT4-Laufwerk
/0/3 scsi4 storage
/0/3/0.0.0 /dev/sdc disk 120GB KINGSTON SV300S3
/0/3/0.0.0/0 /dev/sdc disk 120GB
/0/3/0.0.0/0/1 /dev/sdc1 volume 55GiB EXT4-Laufwerk
/0/3/0.0.0/0/2 /dev/sdc2 volume 55GiB EXT4-Laufwerk
/1 power To Be Filled By O.E.M.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: snapd 2.33.1+18.04
ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
Uname: Linux 4.15.0-24-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Jun 29 07:06:55 2018
InstallationDate: Installed on 2018-06-28 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180619)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_AT.UTF-8
 SHELL=/bin/bash
SourcePackage: snapd
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.