do-realase-upgrade -d (from focal0 stops with bad package info

[PiotrN]

Tried to test RC for 20.10, I used

do-release-upgrade -d

but it stopped saying that the package information where bad
and there is no

ubuntu-minimal

to be found.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.28
Uname: Linux 5.7.12-050712-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
Date: Tue Oct 20 14:22:39 2020
InstallationDate: Installed on 2020-07-31 (80 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2020-10-20 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2020-10-20 14:20:20.039561
 Log time: 2020-10-20 14:20:23.793659
 Log time: 2020-10-20 14:22:39.046274
 Log time: 2020-10-20 14:22:41.030011
mtime.conffile..etc.update-manager.release-upgrades: 2020-07-31T17:32:59.301071

[Brian Murray (brian-murray)]

It looks like there was an error communicating with the mirror of the Ubuntu archive which you use.

2020-10-20 14:20:53,870 DEBUG verifySourcesListEntry: deb http://pl.archive.ubuntu.com/ubuntu/ groovy main restricted
2020-10-20 14:20:53,870 DEBUG url_downloadable: http://pl.archive.ubuntu.com/ubuntu//dists/groovy/Release
2020-10-20 14:20:53,870 DEBUG s='http' n='pl.archive.ubuntu.com' p='/ubuntu//dists/groovy/Release' q='' f=''
2020-10-20 14:20:53,882 DEBUG error from httplib: '<urlopen error [Errno -2] Ta nazwa lub usługa jest nieznana>'

This is a situation you'll need to sort out before you'll be able to upgrade.