can not upgrade to ubuntu 19 due to a network issue

[Nathanel]

Invalid package information

After updating your package information, the essential package
'ubuntu-minimal' could not be located. This may be because you have
no official mirrors listed in your software sources, or because of
excessive load on the mirror you are using. See /etc/apt/sources.list
for the current list of configured software sources.
In the case of an overloaded mirror, you may want to try the upgrade
again later.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: ubuntu-release-upgrader-core 1:18.10.11.7 [origin: unknown]
ProcVersionSignature: Ubuntu 4.18.0-19.20-generic 4.18.20
Uname: Linux 4.18.0-19-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.3
Architecture: amd64
CrashDB: ubuntu
Date: Fri May 10 17:42:27 2019
InstallationDate: Installed on 2018-10-31 (191 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to cosmic on 2019-05-10 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2019-05-10 17:41:47.979439
 Log time: 2019-05-10 17:41:54.243232
 Log time: 2019-05-10 17:42:26.658016
 Log time: 2019-05-10 17:42:29.529516
mtime.conffile..etc.update-manager.release-upgrades: 2019-05-08T19:22:41.994898

[Steve Beattie (sbeattie)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. We appreciate the difficulties you are facing, but this appears to be a "regular" (non-security) bug. I have unmarked it as a security issue since this bug does not show evidence of allowing attackers to cross privilege boundaries nor directly cause loss of data/privacy. Please feel free to report any other bugs you may find.

[Brian Murray (brian-murray)]

There is something wrong with your network configuration as you cannot reach the Ubuntu archive. From VarLogDistupgradeMainlog.txt:

2019-05-10 17:42:04,506 DEBUG verifySourcesListEntry: deb http://archive.ubuntu.com/ubuntu disco main restricted
2019-05-10 17:42:04,506 DEBUG url_downloadable: http://archive.ubuntu.com/ubuntu/dists/disco/Release
2019-05-10 17:42:04,506 DEBUG s='http' n='archive.ubuntu.com' p='/ubuntu/dists/disco/Release' q='' f=''
2019-05-10 17:42:04,511 DEBUG error from httplib: '<urlopen error [Errno 101] Network is unreachable>'
2019-05-10 17:42:04,511 DEBUG entry '# deb http://archive.ubuntu.com/ubuntu cosmic main restricted' was disabled (no Release file)

You'll need to resolve this issue and try the upgrade again.

[Launchpad Janitor (janitor)]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.]