How to check Fedora 23 consistency after upgrade?

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Hey guys,

I was following this tutorial to upgrade my system from Fedora 22 to Fedora 23, but I don't think my installation was finished succesfully. How can I check the consistency of Fedora 23 after the upgrade?

I've run sudo dnf system-upgrade reboot and then I wait for the system to boot up. Some lines of text appeared on the screen and the cursor start blinking, so I thought that the installation was on the run and I go take a lunch. When I come back from the lunch, the screen has exactly the same: a black screen with the same text. So I opened a Terminal pressing a combination of keys (envolving ALT, F3 and one more key) and rebooted my PC. My system take about 1 minute to start rebooting.

After that, Fedora 23 appeared in GRUB (together with the Fedora 22) and then I selected it. It take a lot of time to start and now I'm using it, but some weird things are happening (e.g: bugs on Files, slow computer) and I would like to check the consistency of the system upgrade / installation. How can I achieve that?

Edit

When I run some DNF command, I always get a Python error (the command is run succesfully, but I always get an error):

Traceback (most recent call last):
  File "/bin/dnf", line 57, in <module>
    main.user_main(sys.argv[1:], exit_code=True)
  File "/usr/lib/python3.4/site-packages/dnf/cli/main.py", line 174, in user_main
    errcode = main(args)
  File "/usr/lib/python3.4/site-packages/dnf/cli/main.py", line 60, in main
    return _main(base, args)
  File "/usr/lib/python3.4/site-packages/dnf/base.py", line 99, in __exit__
    self.close()
  File "/usr/lib/python3.4/site-packages/dnf/base.py", line 280, in close
    self._tempfile_persistor.get_saved_tempfiles())
  File "/usr/lib/python3.4/site-packages/dnf/persistor.py", line 475, in get_saved_tempfiles
    return self._get_json_db(self.db_path)
  File "/usr/lib/python3.4/site-packages/dnf/persistor.py", line 417, in _get_json_db
    default = json.loads(content)
  File "/usr/lib64/python3.4/json/__init__.py", line 318, in loads
    return _default_decoder.decode(s)
  File "/usr/lib64/python3.4/json/decoder.py", line 343, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib64/python3.4/json/decoder.py", line 359, in raw_decode
    obj, end = self.scan_once(s, idx)
ValueError: Expecting ',' delimiter: line 1 column 201229 (char 201228)