[Bug 1825938] Re: Cannot update to 19.04 ubuntu-minimal could not be located

[Vivien Milat]

This issue affected me too, and I think I figured out what the issue is.

When the do-release upgrade script gives this prompt,
While scanning your repository information no mirror entry for the
upgrade was found. This can happen if you run an internal mirror or
if the mirror information is out of date.

Do you want to rewrite your 'sources.list' file anyway? If you choose
'Yes' here it will update all 'cosmic' to 'disco' entries.

and you say yes, it doesn't actually update all the 'cosmic' entries to
'disco'. Instead, it comments out the cosmic entries to
mirrors.digitalocean.com, leaving only a few security.ubuntu.com entries
uncommented. (I presume the ubuntu-minimal package is not available from
those sources)

I confirmed this by opening another SSH session at this prompt:
 Third party sources disabled

Some third party entries in your sources.list were disabled. You can
re-enable them after the upgrade with the 'software-properties' tool
or your package manager.

To continue please press [ENTER]
... and then I went to look at /etc/apt/sources.list and found most of the entries commented. I uncommented all the entries for mirrors.digitalocean.com, changed cosmic to disco, then went back to the original SSH session, hit enter, and suddenly the upgrade proceeded.

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https://bugs.launchpad.net/bugs/1825938

Title:
  Cannot update to 19.04 ubuntu-minimal could not be located

Status in ubuntu-release-upgrader package in Ubuntu:
  Incomplete

Bug description:
  This happens on two different machines running VPS on DigitalOcan,
  both trying to update, one from 18.04, the other from 18.10

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: ubuntu-release-upgrader-core 1:18.10.11.6
  ProcVersionSignature: Ubuntu 4.18.0-17.18-generic 4.18.20
  Uname: Linux 4.18.0-17-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13.2
  Architecture: amd64
  CrashDB: ubuntu
  Date: Tue Apr 23 07:22:43 2019
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to cosmic on 2019-04-23 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2019-04-23 07:06:30.943188
   Log time: 2019-04-23 07:11:57.621194

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