Public bug reported:

I did allow normal installs, not only lts. but it always ends with the
same error

output of lsb_release -rd:
`root@play:~# lsb_release -rd
Description:    Ubuntu 18.04.2 LTS
Release:        18.04`

output of do-release-upgrade:
`root@play:~# do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]
Get:2 Upgrade tool [1,243 kB]
Fetched 1,244 kB in 0s (0 B/s)
authenticate 'cosmic.tar.gz' against 'cosmic.tar.gz.gpg'
extracting 'cosmic.tar.gz'
can't load DistUpgradeViewText ([Errno 20] Not a directory: 
'/var/log/installer/media-info')
can't load DistUpgradeViewGtk3 (Namespace Vte not available)
can't load DistUpgradeViewKDE (No module named 'PyQt4')
can't load DistUpgradeViewText ([Errno 20] Not a directory: 
'/var/log/installer/media-info')
No view can be imported, aborting
`

I'm not sure what is going on, but I did have some DNS related issues
where resolv.conf was getting overwritten with the 127 address which
made apt, wget, ping stop working.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.31
ProcVersionSignature: Ubuntu 4.15.0-47.50-generic 4.15.18
Uname: Linux 4.15.0-47-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
CrashDB: ubuntu
Date: Mon Apr 29 17:45:06 2019
PackageArchitecture: all
ProcEnviron:
 TERM=screen
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: Upgraded to bionic on 2019-04-29 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2019-04-29T00:55:40.078049

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic dist-upgrade third-party-packages upgrade

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https://bugs.launchpad.net/bugs/1826896

Title:
  do-release-upgrade fails after cosmic.tar.gz extraction on 18.04.2 LTS

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