There was a bug fix awhile back for this problem: `do-release-upgrade` selects 18.04 instead of 17.10 target. My problem is the opposite of this bug fix.
On my test partition when I try to upgrade 16.04 to 18.04 and I run:
~$ sudo do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]
Get:2 Upgrade tool [1,253 kB]
Fetched 1,254 kB in 0s (0 B/s)
authenticate 'artful.tar.gz' against 'artful.tar.gz.gpg'
extracting 'artful.tar.gz'
It is selecting Artful (17.10) and not Bionic (18.04).
If I change /etc/update-manager/release-upgrades
last line from:
Prompt=normal
to:
Prompt=lts
and rerun do-release-upgrade
I get this:
$ sudo do-release-upgrade
Checking for a new Ubuntu release
No new release found.
Assuming 18.04 has been properly populated into Canonical Repositories, what am I doing wrong???