package grub-efi-amd64-signed 1.155.4+2.04-1ubuntu35.4 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

[Matheus Bordin Gomes]

I didn't notice anything wrong, beside the window with the bug report.

ProblemType: Package
DistroRelease: Ubuntu 20.10
Package: grub-efi-amd64-signed 1.155.4+2.04-1ubuntu35.4
ProcVersionSignature: Ubuntu 5.8.0-44.50-generic 5.8.18
Uname: Linux 5.8.0-44-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu50.5
Architecture: amd64
CasperMD5CheckResult: skip
Date: Wed Feb 24 12:18:03 2021
ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
Python3Details: /usr/bin/python3.8, Python 3.8.6, python3-minimal, 3.8.6-0ubuntu1
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.20.5ubuntu2
 apt 2.1.10ubuntu0.2
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.155.4+2.04-1ubuntu35.4 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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

[geole0 (geole0)]

Hello
So, in chroot mode
root@ubuntu:/# grub-install -
Installation pour la plate-forme x86_64-efi.
grub-install : attention : Cannot read EFI Boot* variables.
grub-install : attention : read_file: could not read from file: Erreur d'entrée/sortie.
grub-install : attention : vars_get_variable: read_file(/sys/firmware/efi/vars/Boot002A-8be4df61-93ca-11d2-aa0d-00e098032b8c/raw_var) failed: Erreur d'entrée/sortie.
grub-install : attention : efi_get_variable: ops->get_variable failed: Erreur d'entrée/sortie.
grub-install : erreur : failed to register the EFI boot entry: Erreur d'entrée/sortie.

[geole0 (geole0)]

Under liveusb and during installation

ubuntu@ubuntu:journalctl -g attention
-- Logs begin at Tue 2021-03-02 19:51:25 CET, end at Wed 2021-03-03 10:34:34 CET. --
mars 03 00:41:32 ubuntu ubiquity[59340]: grub-install : attention : Cannot read EFI Boot* variables.
mars 03 00:41:32 ubuntu ubiquity[59340]: grub-install : attention :
mars 03 00:41:32 ubuntu ubiquity[59340]: grub-install : attention : vars_get_variable: read_file(/sys/firmware/efi/vars/Boot0004-8be4df61-93ca-11d2-aa0d-00e098032b8c/r>
mars 03 00:41:32 ubuntu ubiquity[59340]: grub-install : attention : efi_get_variable: ops->get_variable failed: Erreur d'entrée/sortie.
lines 1-5/5 (END)

ubuntu@ubuntu:/target/sys/firmware/efi/vars/Boot0004-8be4df61-93ca-11d2-aa0d-00e098032b8c$ ls -ls
total 0
0 -r-------- 1 root root 4096 mars 3 10:30 attributes
0 -r-------- 1 root root 4096 mars 3 10:30 data
0 -r-------- 1 root root 4096 mars 3 10:30 guid
0 -rw------- 1 root root 4096 mars 3 10:30 raw_var
0 -r-------- 1 root root 4096 mars 3 10:30 size
ubuntu@ubuntu:/target/sys/firmware/efi/vars/Boot0004-8be4df61-93ca-11d2-aa0d-00e098032b8c$

[geole0 (geole0)]

Hello
It seeems that it is the same thing with hirsute!
https://forum.ubuntu-fr.org/viewtopic.php?pid=22427092#p22427092