I updated and upgraded all packages on my Ubuntu 16.04.7 LTS (Xenial Xerus) in preparation for a release upgrade to 18.04 (Bionic).
I have checked other posts, but my problem is a little different.
I continually get the following message when I run do-release-upgrade:
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]
Err Upgrade tool
503 Service Unavailable [IP: 185.125.190.36 80]
Fetched 819 B in 0s (0 B/s)
WARNING:root:file 'bionic.tar.gz' missing
Failed to fetch
Fetching the upgrade failed. There may be a network problem.
I do not know why the system is choosing that IP address and I don't know how to change it.
When I point a web browser at http://185.125.190.36, I see that it does not have the bionic release, Ubuntu 18.04.
I have tried entering various things in /etc/apt/list.sources but nothing works.
For example,
deb https://apache.bintray.com/couchdb-deb bionic main
was suggested but the do-release-upgrade ignores it.
How can I fix this issue?
