[Bug 2003222] [NEW] Subiquity crash on Lenovo X13s

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The following crash occurs in curtin.
The device does not provide access to UEFI variables at runtime.

The error from efibootmgr should only result in a warning and not stop
the installation process.

         finish: cmd-install/stage-curthooks/builtin/cmd-curthooks/install-grub: FAIL: installing grub to target devices
         finish: cmd-install/stage-curthooks/builtin/cmd-curthooks/configuring-bootloader: FAIL: configuring target system bootloader
         finish: cmd-install/stage-curthooks/builtin/cmd-curthooks: FAIL: curtin command curthooks
         Traceback (most recent call last):
           File "/snap/subiquity/4236/lib/python3.8/site-packages/curtin/commands/main.py", line 202, in main
             ret = args.func(args)
           File "/snap/subiquity/4236/lib/python3.8/site-packages/curtin/commands/curthooks.py", line 1903, in curthooks
             builtin_curthooks(cfg, target, state)
           File "/snap/subiquity/4236/lib/python3.8/site-packages/curtin/commands/curthooks.py", line 1868, in builtin_curthooks
             setup_grub(cfg, target, osfamily=osfamily,
           File "/snap/subiquity/4236/lib/python3.8/site-packages/curtin/commands/curthooks.py", line 818, in setup_grub
             efi_orig_output = util.get_efibootmgr(target)
           File "/snap/subiquity/4236/lib/python3.8/site-packages/curtin/util.py", line 967, in get_efibootmgr
             stdout, _ = in_chroot.subp(['efibootmgr', '-v'], capture=True)
           File "/snap/subiquity/4236/lib/python3.8/site-packages/curtin/util.py", line 787, in subp
             return subp(*args, **kwargs)
           File "/snap/subiquity/4236/lib/python3.8/site-packages/curtin/util.py", line 275, in subp
             return _subp(*args, **kwargs)
           File "/snap/subiquity/4236/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', 'efibootmgr', '-v']
         Exit code: 2
         Reason: -
         Stdout: ''
         Stderr: EFI variables are not supported on this system.
                 
         Unexpected error while running command.
         Command: ['unshare', '--fork', '--pid', '--', 'chroot', '/target', 'efibootmgr', '-v']
         Exit code: 2
         Reason: -
         Stdout: ''
         Stderr: EFI variables are not supported on this system.

** Affects: subiquity (Ubuntu)
     Importance: Undecided
         Status: New

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Subiquity crash on Lenovo X13s
https://bugs.launchpad.net/bugs/2003222
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