I'm trying to upgrade from 13.04 to 13.10 following this guide: http://www.unixmen.com/upgrade-ubuntu-13-04-raring-ubuntu-13-10-saucy-salamander/
user@computer:~ update-manager Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 9: reading configurations from ~/.fonts.conf is deprecated. Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 9: reading configurations from ~/.fonts.conf is deprecated. gpg: /tmp/tmp82g1kk/trustdb.gpg: trustdb created Checking for a new Ubuntu release WARNING:root:file 'saucy.tar.gz.gpg' missing Traceback (most recent call last): File "/usr/bin/do-release-upgrade", line 152, in <module> fetcher.run() File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcherCore.py", line 278, in run _("Fetching the upgrade failed. There may be a network " File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcher.py", line 50, in error return error(self.window_main.window_main, summary, message) AttributeError: 'NoneType' object has no attribute 'window_main'