[Bug 1915334] Re: Install of 20.10 fails

[PascalC]

Cause: your /boot is full or too small

grub-install: Fehler: »/usr/lib/grub/x86_64-efi-
signed/grubx64.efi.signed« kann nicht nach
»/boot/efi/EFI/ubuntu/grubx64.efi« kopiert werden: Auf dem Gerät ist
kein Speicherplatz mehr verfügbar.

$ df -h /boot

better keep it no more than 60% full
to make some space you have to uninstall oldest kernel

List installed kernels
# dpkg -l linux-* | grep ^ii

check your current kernel level
# uname -r

Uninstall kernels keeping current one and maybe one level older too
# apt purge linux-image-VERSION-generic linux-modules-VERSION-generic linux-modules-extra-VERSION-generic

with VERSION the kernel versions that you are not currently using (dont
remove the one shown by uname -r)

then recheck /boot size

# df -h /boot

then try upgrade

-- 
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https://bugs.launchpad.net/bugs/1915334

Title:
  Install of 20.10 fails

Status in grub-installer package in Ubuntu:
  New

Bug description:
  Tried to reinstall Ubuntu on my mashine but it fails while trying to
  install grub.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: ubiquity 20.10.13
  ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14
  Uname: Linux 5.8.0-25-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu50
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.455
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Feb 10 22:23:34 2021
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
  LiveMediaBuild: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
  ProcEnviron:
   LANGUAGE=de_DE.UTF-8
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   LC_NUMERIC=C.UTF-8
  RebootRequiredPkgs:
   linux-image-5.8.0-43-generic
   linux-base
   linux-image-5.8.0-25-generic
   linux-base
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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