With an MVME drive pluged into a PCIe slot grub will always say that it can't write to any partition I choose.

[Juergen Kieser]

I tried eveything. Boot from USB Stick, from internal SSD or from NVME on a PCIe adaptor. I tried to let grub install on /dev/sda or sdb or sdc or /dev/sda1 and so on. Nothing works. Even a fully automated installation - although not complaining - won't boot afterwards.
Maybe I should unplug the NVME PCIe adaptor and try to use only a SSD ....

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
Date: Sun Jun 10 18:51:55 2018
InstallCmdLine: file=/cdrom/preseed/ubuntu-mate.seed boot=casper initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Phillip Susi (psusi)]

In this case it looks like you tried to install grub to a partition. You need to install it to a whole disk, such as /dev/nvme0n1 or /dev/sda. If that fails, please attach an updated /var/log/syslog.

[Launchpad Janitor (janitor)]

[Expired for grub-installer (Ubuntu) because there has been no activity for 60 days.]