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I'm trying to upgrade my Ubuntu distribution to version 17.10 Artful Aardvark from my current version, which is either 17.04 Zesty Zapus or 16.10 Yakkety Yak.

Ok, so I start out with the standard

sudo do-release-upgrade

I encounter multiple PPA errors (Err http://ppa.launchpad.net/fkrull/deadsnakes/ubuntu yakkety Release 404 Not Found and the like).

It asks if I want to rewrite my sources.list in order to update zesty entries to artful. I say yes. It then says no valid entries for zesty are found and asks if it should add default entries for artful. I say yes. It disables third-party sources.

It appears to do an apt update and then halts saying

Error during update

A problem occurred during the update. This is usually some sort of network problem, please check your network connection and retry.

There is no network problem.

It goes on in its error message to mention how some repositories do not have a Release file, though it doesn't indicate that this is a major problem.

Then, it halts, saying only

Restoring original system state

To try to address what seems to be problems arising from third-party sources, I try to remove them, starting with running a sudo apt-add-repository -r ppa:fkrull/deadsnakes I encounter an error that ends with the following:

aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template for Ubuntu/zesty

So, now I don't know what to do. The error messages don't make sense to me and I've seen references both to yakkety and zesty.

I ran lsb_release -a and it returns the following:

No LSB modules are available
Distributor ID: Ubuntu
Description:    Ubuntu Zesty Zapus (development branch)
Release:        17.04
Codename:       zesty

When I do egrep -v '^#|^ *$' /etc/apt/sources.list /etc/apt/sources.list.d/* I see many references to yakkety and no references to zesty.

Can anyone guess at what might be wrong and how I might advance out of this mess?

EDIT: A suggestion from @pomsky prompted me to modify /etc/apt/sources.list.

First, I changed the sources to old-releases.ubuntu.com. With this the problems continued. Second, I changed all yakkety references to zesty references. This seemed to make things work.

The do-release-upgrade then ran as expected and apparently successfully and the references in sources.list changed from zesty to artful.

BlandCorporation
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    Related (but unanswered): https://askubuntu.com/questions/866052/lsb-release-in-xubuntu-showing-17-04-zesty-zapus-development-branch – WinEunuuchs2Unix Mar 19 '18 at 11:46
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    Have you tried this https://askubuntu.com/questions/91815/how-to-install-software-or-upgrade-from-an-old-unsupported-release? – pomsky Mar 19 '18 at 13:46
  • @pomsky Thanks for that suggestion. The solution there didn't work, but prompted me to change distribution name references in sources.list manually and this seems to have made things work. I've edited my question accordingly. – BlandCorporation Mar 19 '18 at 17:40

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