I'm seeing something similar on an ASUS desktop PC (AMD socket FM2, DDR3) which already has a few dual-boot options installed. I'm trying to install groovy 20.10 using Ubiquity from the live CD/DVD/USB. The installer goes through most of its paces, until it tries to install GRUB. It then dies with a pop-up box:
Error installing grub-efi-amd64-signed installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1 Attempting to install the package manually from a live desktop terminal window also fails, with: $ sudo su - # chroot /target # apt install grub-efi-amd64 giving: Setting up grub-efi-amd64 (2.04-1ubuntu35.1) ... Installing grub to /boot/efi. Installing for x86_64-efi platform. grub-install: warning: Cannot read EFI Boot* variables. grub-install: warning: read_file: could not read from file: Input/output error. grub-install: warning: vars_get_variable: read_file(/sys/firmware/efi/vars/Boot000C-8be4df61-93ca-11d2-aa0d-00e098032b8c/raw_var) failed : Input/output error. grub-install: warning: efi_get_variable: ops->get_variable failed: Input/output error. grub-install: error: failed to register the EFI boot entry: Input/output error. The workaround seems to be, while the installer is stopped at the error message box but still open, launching a terminal window from the live desktop and mounting efivarfs manually. At that point, apt may be used to install the package, install grub, apt upgrade everything to the current release... whatever. sudo su - chroot /mount/target sh -c "mount -t efivarfs efivarfs /sys/firmware/efi/efivars; grub-install; update-grub; apt install --reinstall grub-efi-amd64-signed After that, I was able to reboot into Ubuntu 20.10 (groovy) from the internal SSD. Without that, I could try the installer any number of times and it would always fail the same way. bugs.debian.org/cgi-bin/bugreport.cgi?bug=933523 looks to be related bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1874315 might be as well? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1905522 Title: Error in fresh install of Ubuntu 20.10 package grub-efi-amd64-signed 1.155.1+2.04-1ubuntu35.1 failed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1905522/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
