I tried to upgrade to 15.10 and got minimal package couldn't be found

[Larry Griffin]

What the summary says.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubuntu-release-upgrader-core 1:15.04.14.3
ProcVersionSignature: Ubuntu 3.19.0-42.48-generic 3.19.8-ckt10
Uname: Linux 3.19.0-42-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.8
Architecture: amd64
CrashDB: ubuntu
Date: Sat Dec 19 12:53:59 2015
InstallationDate: Installed on 2015-10-28 (51 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to vivid on 2015-12-19 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2015-12-19 12:51:35.455587
 Log time: 2015-12-19 12:52:29.397945
 Log time: 2015-12-19 12:53:35.866042
 Log time: 2015-12-19 12:54:21.842333
VarLogDistupgradeTermlog: