$ sudo DEBUG_UPDATE_MANAGER=1 /usr/bin/do-release-upgrade
Checking for a new ubuntu release
MetaRelease.__init__() useDevel=False useProposed=False
/etc/update-manager/meta-release: http://changelogs.ubuntu.com/meta-release
/etc/update-manager/meta-release: http://changelogs.ubuntu.com/meta-release-lts
/etc/update-manager/meta-release: -development
/etc/update-manager/meta-release: -proposed
metarelease-uri: http://changelogs.ubuntu.com/meta-release
MetaRelease.download()
have self.metarelease_information
MetaRelease.parse()
current dist name: 'jaunty'
new dist: <UpdateManager.Core.MetaRelease.Dist object at 0xb78780ac>
trying to find suitable mirror
mirror_from_sources_list: jaunty
trying to find suitable mirror
mirror_from_sources_list: jaunty
Failed Upgrade tool signature
Failed Upgrade tool
Done downloading
Failed to fetch
Fetching the upgrade failed. There may be a network problem.
after downloading the content of http:// changelogs. ubuntu. com/meta- release manually to /var/lib/ update- manager/ meta-release, the script runs a little bit further:
Debug output of do-release-upgrade now shows:
$ sudo DEBUG_UPDATE_ MANAGER= 1 /usr/bin/ do-release- upgrade __init_ _() useDevel=False useProposed=False manager/ meta-release: http:// changelogs. ubuntu. com/meta- release manager/ meta-release: http:// changelogs. ubuntu. com/meta- release- lts manager/ meta-release: -development manager/ meta-release: -proposed changelogs. ubuntu. com/meta- release download( ) e_information Core.MetaReleas e.Dist object at 0xb78780ac> from_sources_ list: jaunty from_sources_ list: jaunty
Checking for a new ubuntu release
MetaRelease.
/etc/update-
/etc/update-
/etc/update-
/etc/update-
metarelease-uri: http://
MetaRelease.
have self.metareleas
MetaRelease.parse()
current dist name: 'jaunty'
new dist: <UpdateManager.
trying to find suitable mirror
mirror_
trying to find suitable mirror
mirror_
Failed Upgrade tool signature
Failed Upgrade tool
Done downloading
Failed to fetch
Fetching the upgrade failed. There may be a network problem.