On system conforming to the Embedded Base Boot Requirements (EBBR) specification it is allowable that the UEFI runtime service SetVariable() is not available. This means that the BOOTXXXX variable for invoking GRUB cannot be set automatically. Instead this has to be left to the user.
Traceback (most recent call last):
File "/snap/subiquity/x1/lib/python3.8/site-packages/curtin/commands/main.py", line 202, in main
ret = args.func(args)
File "/snap/subiquity/x1/lib/python3.8/site-packages/curtin/commands/curthooks.py", line 1886, in curthooks
builtin_curthooks(cfg, target, state)
File "/snap/subiquity/x1/lib/python3.8/site-packages/curtin/commands/curthooks.py", line 1851, in builtin_curthooks
setup_grub(cfg, target, osfamily=osfamily,
File "/snap/subiquity/x1/lib/python3.8/site-packages/curtin/commands/curthooks.py", line 804, in setup_grub
install_grub(instdevs, target, uefi=uefi_bootable, grubcfg=grubcfg)
File "/snap/subiquity/x1/lib/python3.8/site-packages/curtin/commands/install_grub.py", line 401, in install_grub
in_chroot.subp(cmd, env=env, capture=True)
File "/snap/subiquity/x1/lib/python3.8/site-packages/curtin/util.py", line 780, in subp
return subp(*args, **kwargs)
File "/snap/subiquity/x1/lib/python3.8/site-packages/curtin/util.py", line 275, in subp
return _subp(*args, **kwargs)
File "/snap/subiquity/x1/lib/python3.8/site-packages/curtin/util.py", line 139, in _subp
raise ProcessExecutionError(stdout=out, stderr=err,
curtin.util.ProcessExecutionError: Unexpected error while running command.
Command: ['unshare', '--fork', '--pid', '--', 'chroot', '/target', '/usr/lib/grub/grub-multi-install']
Exit code: 1
Reason: -
Stdout: ''
Stderr: Installing grub to /boot/efi.
Installing for riscv64-efi platform.
grub-install: warning: Cannot set EFI variable Boot0000.
grub-install: warning: efivarfs_set_variable: failed to create /sys/firmware/efi/efivars/Boot0000-8be4df61-93ca-11d2-aa0d-00e098032b8c for writing: Read-only file system.
grub-install: warning: _efi_set_variable_mode: ops->set_variable() failed: Read-only file system.
grub-install: error: failed to register the EFI boot entry: Read-only file system.
Unexpected error while running command.
Command: ['unshare', '--fork', '--pid', '--', 'chroot', '/target', '/usr/lib/grub/grub-multi-install']
Exit code: 1
Reason: -
Stdout: ''
Stderr: Installing grub to /boot/efi.
Installing for riscv64-efi platform.
grub-install: warning: Cannot set EFI variable Boot0000.
grub-install: warning: efivarfs_set_variable: failed to create /sys/firmware/efi/efivars/Boot0000-8be4df61-93ca-11d2-aa0d-00e098032b8c for writing: Read-only file system.
grub-install: warning: _efi_set_variable_mode: ops->set_variable() failed: Read-only file system.
grub-install: error: failed to register the EFI boot entry: Read-only file system.
This bug was fixed in the package grub2 - 2.06-2ubuntu6
---------------
grub2 (2.06-2ubuntu6) jammy; urgency=medium
[ Heinrich Schuchardt ]
* efivar: check that efivarfs is writeable (LP: #1965288)
[ Dimitri John Ledkov ]
* Do not validate kernels twice. (LP: #1964943)
[ Heinrich Schuchardt ]
* efi: EFI Device Tree Fixup Protocol (LP: #1965796)
* fdt: add debug output to devicetree command
-- Julian Andres Klode <email address hidden> Fri, 25 Mar 2022 16:03:11 +0100