The error in your log is:
shim-signed (1.34.9+13-0ubuntu2) wird eingerichtet ...
x86_64-efi wird für Ihre Plattform installiert.
Could not prepare Boot variable: No space left on device
grub-install: Fehler: efibootmgr failed to register the boot entry:
Eingabe-/Ausgabefehler.
[1mdpkg:[0m Fehler beim Bearbeiten des Paketes shim-signed (--configure):
This indicates that there is a problem writing the bootloader information to
your firmware's nvram. It is a requirement that UEFI systems allow writing to
these variables from the OS in order to update the boot options.
According to your bug report, you initially installed Ubuntu 17.10. Is
it possible your firmware's nvram is locked because you are affected by
bug #1734147?
Is it possible that you have somehow toggled a "lock" on the firmware
variables, preventing them from being updated? I understand that some
Lenovo firmware has such an option, did you knowingly turn it on?
Your existing firmware boot config shows no entry for ubuntu, and no
BootOrder variable. How do you boot Ubuntu on this system, since it's
not a boot option in your firmware config?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
** Summary changed:
- package shim-signed 1.34.9+13-0ubuntu2 [origin: Ubuntu] failed to
install/upgrade: Unterprozess installed shim-signed package post-installation
script gab den Fehler-Ausgangsstatus 1 zurück
+ Could not prepare Boot variable: No space left on device (package shim-signed
1.34.9+13-0ubuntu2 [origin: Ubuntu] failed to install/upgrade: Unterprozess
installed shim-signed package post-installation script gab den
Fehler-Ausgangsstatus 1 zurück)
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1776271
Title:
Could not prepare Boot variable: No space left on device (package
shim-signed 1.34.9+13-0ubuntu2 [origin: Ubuntu] failed to
install/upgrade: Unterprozess installed shim-signed package post-
installation script gab den Fehler-Ausgangsstatus 1 zurück)
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1776271/+subscriptions
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