I have update my notebook since Fedora 18 to Fedora 26 always without
problem.

Today I have try to update Fedora 26 to 27, but after download packages
and run "dnf system-upgrade reboot", when the system restart the update
fail after a while after this boot message:

             Starting System Upgrade using DNF...
    [  OK  ] Listening on D-Bus System Message Bus Socket.
             Starting Update the operating system whilst offline...
    [  OK  ] Started Update the operating system whilst offline.
    [  205.755691] dnf[967]: Errore: Sincronizzazione cache non riuscita per il 
repo 'updates'
    [FAILED] Failed to start System Upgrade using DNF.
    See 'systemctl status dnf-system-upgrade.service' for details.

I restart the notebook in Fedora 26 and into log I fount this error:

    2017-11-16T15:37:58Z INFO --- logging initialized ---
    2017-11-16T15:37:58Z DDEBUG timer: config: 4 ms
    2017-11-16T15:37:58Z DEBUG Loaded plugins: builddep, config-manager, copr, 
debug, debuginfo-install, download, generate_completion_cache, 
needs-restarting, playground, repoclosure, repograph, repomanage, reposync, 
system-upgrade
    2017-11-16T15:37:58Z DEBUG DNF version: 2.7.5
    2017-11-16T15:37:58Z DDEBUG Command: dnf system-upgrade reboot 
    2017-11-16T15:37:58Z DDEBUG Installroot: /
    2017-11-16T15:37:58Z DDEBUG Releasever: 26
    2017-11-16T15:37:58Z DEBUG cachedir: /var/cache/dnf
    2017-11-16T15:37:58Z DDEBUG Base command: system-upgrade
    2017-11-16T15:37:58Z DDEBUG Extra commands: ['system-upgrade', 'reboot']
    2017-11-16T15:37:58Z DDEBUG Cleaning up.
    2017-11-16T15:39:15Z INFO --- logging initialized ---
    2017-11-16T15:39:15Z DDEBUG timer: config: 1240 ms
    2017-11-16T15:39:16Z DEBUG Loaded plugins: builddep, config-manager, copr, 
debug, debuginfo-install, download, generate_completion_cache, 
needs-restarting, playground, repoclosure, repograph, repomanage, reposync, 
system-upgrade
    2017-11-16T15:39:16Z DEBUG DNF version: 2.7.5
    2017-11-16T15:39:16Z DDEBUG Command: dnf --releasever=27 system-upgrade 
upgrade 
    2017-11-16T15:39:16Z DDEBUG Installroot: /
    2017-11-16T15:39:16Z DDEBUG Releasever: 27
    2017-11-16T15:39:16Z DEBUG cachedir: /var/cache/dnf
    2017-11-16T15:39:16Z DDEBUG Base command: system-upgrade
    2017-11-16T15:39:16Z DDEBUG Extra commands: ['--releasever=27', 
'system-upgrade', 'upgrade']
    2017-11-16T15:39:31Z DEBUG repository: uso della cache per 
adobe-linux-x86_64
    2017-11-16T15:39:31Z DEBUG not found deltainfo for: Adobe Systems 
Incorporated
    2017-11-16T15:39:31Z DEBUG not found updateinfo for: Adobe Systems 
Incorporated
    2017-11-16T15:39:31Z DEBUG adobe-linux-x86_64: usando metadati di gio 26 
ott 2017 06:39:15 CEST.
    2017-11-16T15:39:31Z DEBUG Impossibile scaricare '    
https://mirrors.fedoraproject.org/metalink?repo=updates-released-f27&arch=x86_64'
    : Cannot prepare internal mirrorlist: Curl error (6): Couldn't resolve host 
name for     
https://mirrors.fedoraproject.org/metalink?repo=updates-released-f27&arch=x86_64
     [Could not resolve host: mirrors.fedoraproject.org].
    2017-11-16T15:39:31Z DDEBUG Cleaning up.
    2017-11-16T15:39:32Z SUBDEBUG 
    Traceback (most recent call last):
      File "/usr/lib/python3.6/site-packages/dnf/repo.py", line 229, in _perform
        return super(_Handle, self).perform(result)
      File "/usr/lib64/python3.6/site-packages/librepo/__init__.py", line 1522, 
in perform
        _librepo.Handle.perform(self, result)
    librepo.LibrepoException: (8, "Cannot prepare internal mirrorlist: Curl 
error (6): Couldn't resolve host name for     
https://mirrors.fedoraproject.org/metalink?repo=updates-released-f27&arch=x86_64
     [Could not resolve host: mirrors.fedoraproject.org]", 'An Curl handle 
error')

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "/usr/lib/python3.6/site-packages/dnf/repo.py", line 909, in load
        if self._try_revive():
      File "/usr/lib/python3.6/site-packages/dnf/repo.py", line 857, in 
_try_revive
        return self._try_revive_by_metalink()
      File "/usr/lib/python3.6/site-packages/dnf/repo.py", line 810, in 
_try_revive_by_metalink
        handle._perform()
      File "/usr/lib/python3.6/site-packages/dnf/repo.py", line 233, in _perform
        raise _DetailedLibrepoError(exc, source)
    dnf.repo._DetailedLibrepoError

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 64, in main
        return _main(base, args, cli_class, option_parser_class)
      File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 99, in _main
        return cli_run(cli, base)
      File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 115, in 
cli_run
        cli.run()
      File "/usr/lib/python3.6/site-packages/dnf/cli/cli.py", line 1010, in run
        self._process_demands()
      File "/usr/lib/python3.6/site-packages/dnf/cli/cli.py", line 763, in 
_process_demands
        load_available_repos=self.demands.available_repos)
      File "/usr/lib/python3.6/site-packages/dnf/base.py", line 353, in 
fill_sack
        self._add_repo_to_sack(r)
      File "/usr/lib/python3.6/site-packages/dnf/base.py", line 118, in 
_add_repo_to_sack
        repo.load()
      File "/usr/lib/python3.6/site-packages/dnf/repo.py", line 931, in load
        raise dnf.exceptions.RepoError(msg)
    dnf.exceptions.RepoError: Sincronizzazione cache non riuscita per il repo 
'updates'
    2017-11-16T15:39:32Z CRITICAL Errore: Sincronizzazione cache non riuscita 
per il repo 'updates'

Why the offline update try to connect to "updates" online repo?

What's happen ? someone can help me?

Many thanks  

-- 
Dario Lesca
(inviato dal mio Linux Fedora 26 Workstation)
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