Public bug reported:

Checking for a new Ubuntu release
Your Ubuntu release is not supported anymore.
For upgrade information, please visit:
http://www.ubuntu.com/releaseendoflife

Get:1 Upgrade tool signature [819 B]
Get:2 Upgrade tool [1,257 kB]
Fetched 1,258 kB in 0s (0 B/s)
authenticate 'bionic.tar.gz' against 'bionic.tar.gz.gpg'
extracting 'bionic.tar.gz'
Get:70 http://ru.archive.ubuntu.com/ubuntu bionic-updates/main Translation-en 
[94.5 kB]
Get:71 http://ru.archive.ubuntu.com/ubuntu bionic-updates/universe i386 
Packages [131 kB]
Get:72 http://ru.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 
Packages [131 kB]
Get:73 http://ru.archive.ubuntu.com/ubuntu bionic-updates/universe 
Translation-en [58.8 kB]
Get:74 http://ru.archive.ubuntu.com/ubuntu bionic-updates/multiverse i386 
Packages [3,700 B]
Get:75 http://ru.archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 
Packages [3,544 B]
Get:76 http://ru.archive.ubuntu.com/ubuntu bionic-updates/multiverse 
Translation-en [2,060 B]
Get:77 http://ru.archive.ubuntu.com/ubuntu bionic-proposed/main Sources [18.3 
kB]
Get:78 http://ru.archive.ubuntu.com/ubuntu bionic-proposed/universe Sources 
[8,792 B]
Get:79 http://ru.archive.ubuntu.com/ubuntu bionic-proposed/main i386 Packages 
[33.1 kB]
Get:80 http://ru.archive.ubuntu.com/ubuntu bionic-proposed/main amd64 Packages 
[33.3 kB]
Get:81 http://ru.archive.ubuntu.com/ubuntu bionic-proposed/main Translation-en 
[15.3 kB]
Get:82 http://ru.archive.ubuntu.com/ubuntu bionic-proposed/universe amd64 
Packages [35.1 kB]
Get:83 http://ru.archive.ubuntu.com/ubuntu bionic-proposed/universe i386 
Packages [35.1 kB]
Get:84 http://ru.archive.ubuntu.com/ubuntu bionic-proposed/universe 
Translation-en [16.6 kB]
Get:85 http://ru.archive.ubuntu.com/ubuntu bionic-backports/universe Sources 
[1,160 B]
Get:86 http://ru.archive.ubuntu.com/ubuntu bionic-backports/universe i386 
Packages [2,704 B]
Get:87 http://ru.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 
Packages [2,704 B]
Get:88 http://ru.archive.ubuntu.com/ubuntu bionic-backports/universe 
Translation-en [1,136 B]
Fetched 63.9 MB in 6s (4,178 kB/s)

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done

Calculating the changes

Calculating the changes

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unofficial software packages not provided by Ubuntu

If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: ubuntu-release-upgrader-core 1:17.10.11
ProcVersionSignature: Ubuntu 4.13.0-43.48-generic 4.13.16
Uname: Linux 4.13.0-43-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
ApportVersion: 2.20.7-0ubuntu3.9
Architecture: amd64
CrashDB: ubuntu
Date: Mon Jul 23 01:24:20 2018
InstallationDate: Installed on 2002-01-01 (6046 days ago)
InstallationMedia: Ubuntu-Server 17.04 "Zesty Zapus" - Release amd64 (20170412)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to artful on 2018-07-22 (0 days ago)

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


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

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https://bugs.launchpad.net/bugs/1783022

Title:
  cannot upgrade release 17.10 to 18.04

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