[Howard@dom0 ~]$ sudo qubesctl --show-output state.sls update.qubes-dom0
[WARNING ] /usr/lib/python3.8/site-packages/salt/utils/files.py:396: RuntimeWarning: line buffering (buffering=1) isn't supported in binary mode, the default buffer size will be used
  f_handle = open(*args, **kwargs)  # pylint: disable=resource-leakage

[ERROR   ] Command 'systemd-run' failed with return code: 126
[ERROR   ] stderr: Running scope as unit: run-r57eb49c5db8c44bb88ee5fa0652b213c.scope
Using sys-firewall as UpdateVM to download updates for Dom0; this may take some time...
Running '/usr/lib/qubes/qubes-download-dom0-updates.sh --doit --nogui '--exclude=qubes-template-*' '--quiet' '-y' '--action=upgrade'' on sys-firewall
sys-firewall: command failed with code: 126
[ERROR   ] retcode: 126
[ERROR   ] Problem encountered upgrading packages. Additional info follows:

result:
    ----------
    pid:
        37618
    retcode:
        126
    stderr:
        Running scope as unit: run-r57eb49c5db8c44bb88ee5fa0652b213c.scope
        Using sys-firewall as UpdateVM to download updates for Dom0; this may take some time...
        Running '/usr/lib/qubes/qubes-download-dom0-updates.sh --doit --nogui '--exclude=qubes-template-*' '--quiet' '-y' '--action=upgrade'' on sys-firewall
        sys-firewall: command failed with code: 126
    stdout:
local:
----------
          ID: /etc/yum.repos.d/qubes-dom0.repo
    Function: file.replace
      Result: True
     Comment: No changes needed to be made
     Started: 17:36:53.342556
    Duration: 15.577 ms
     Changes:   
----------
          ID: /etc/yum.repos.d/qubes-templates.repo
    Function: file.replace
      Result: True
     Comment: No changes needed to be made
     Started: 17:36:53.358322
    Duration: 1.702 ms
     Changes:   
----------
          ID: update
    Function: cmd.run
        Name: if qubes-dom0-update --quiet --assumeyes --clean --action=clean expire-cache >/dev/null 2>&1; then
    echo "result=True comment='Cache cleaned'"
else
    echo "result=False comment='Could not clean cache'"
fi

      Result: True
     Comment: Cache cleaned
     Started: 17:36:53.360891
    Duration: 5896.156 ms
     Changes:   
----------
          ID: update
    Function: pkg.uptodate
      Result: False
     Comment: Problem encountered upgrading packages. Additional info follows:
              
              result:
                  ----------
                  pid:
                      37618
                  retcode:
                      126
                  stderr:
                      Running scope as unit: run-r57eb49c5db8c44bb88ee5fa0652b213c.scope
                      Using sys-firewall as UpdateVM to download updates for Dom0; this may take some time...
                      Running '/usr/lib/qubes/qubes-download-dom0-updates.sh --doit --nogui '--exclude=qubes-template-*' '--quiet' '-y' '--action=upgrade'' on sys-firewall
                      sys-firewall: command failed with code: 126
                  stdout:
     Started: 17:37:00.552689
    Duration: 140813.701 ms
     Changes:   

Summary for local
------------
Succeeded: 3
Failed:    1
------------
Total states run:     4
Total run time: 146.727 s
DOM0 configuration failed, not continuing