Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]
Get:2 Upgrade tool [1,254 kB]
Fetched 1,255 kB in 0s (0 B/s)
authenticate 'bionic.tar.gz' against 'bionic.tar.gz.gpg'
extracting 'bionic.tar.gz'
Reading cache
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://security.ubuntu.com/ubuntu bionic-security InRelease
Get:1 http://archive.ubuntu.com/ubuntu bionic InRelease [242 kB]
Get:2 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Get:3 http://archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Get:4 http://archive.ubuntu.com/ubuntu bionic/restricted amd64 Packages [9,184 B]
Get:5 http://archive.ubuntu.com/ubuntu bionic/restricted i386 Packages [9,156 B]
Get:6 http://archive.ubuntu.com/ubuntu bionic/restricted Translation-en [3,584 B]
Get:7 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages [8,570 kB]
Get:8 http://archive.ubuntu.com/ubuntu bionic/universe i386 Packages [8,531 kB]
Get:9 http://archive.ubuntu.com/ubuntu bionic/universe Translation-en [4,941 kB]
Get:10 http://archive.ubuntu.com/ubuntu bionic/universe amd64 DEP-11 Metadata [3,287 kB]
Get:11 http://archive.ubuntu.com/ubuntu bionic/universe DEP-11 64x64 Icons [8,420 kB]
Get:12 http://archive.ubuntu.com/ubuntu bionic/multiverse amd64 Packages [151 kB]
Get:13 http://archive.ubuntu.com/ubuntu bionic/multiverse i386 Packages [144 kB]
Get:14 http://archive.ubuntu.com/ubuntu bionic/multiverse Translation-en [108 kB]
Get:15 http://archive.ubuntu.com/ubuntu bionic/multiverse amd64 DEP-11 Metadata [49.7 kB]
Get:16 http://archive.ubuntu.com/ubuntu bionic/multiverse DEP-11 64x64 Icons [225 kB]
Get:17 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages [1,019 kB]
Get:18 http://archive.ubuntu.com/ubuntu bionic/main i386 Packages [1,007 kB]
Get:19 http://archive.ubuntu.com/ubuntu bionic/main Translation-en [516 kB]
Get:20 http://archive.ubuntu.com/ubuntu bionic/main amd64 DEP-11 Metadata [477 kB]
Get:21 http://archive.ubuntu.com/ubuntu bionic/main DEP-11 64x64 Icons [245 kB]
Get:22 http://archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages [574 kB]
Get:23 http://archive.ubuntu.com/ubuntu bionic-updates/universe i386 Packages [569 kB]
Get:24 http://archive.ubuntu.com/ubuntu bionic-updates/universe Translation-en [154 kB]
Get:25 http://archive.ubuntu.com/ubuntu bionic-updates/universe amd64 DEP-11 Metadata [194 kB]
Get:26 http://archive.ubuntu.com/ubuntu bionic-updates/universe DEP-11 64x64 Icons [314 kB]
Get:27 http://archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 Packages [5,688 B]
Get:28 http://archive.ubuntu.com/ubuntu bionic-updates/multiverse i386 Packages [5,844 B]
Get:29 http://archive.ubuntu.com/ubuntu bionic-updates/multiverse Translation-en [3,176 B]
Get:30 http://archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 DEP-11 Metadata [2,464 B]
Get:31 http://archive.ubuntu.com/ubuntu bionic-updates/multiverse DEP-11 64x64 Icons [2,638 B]
Get:32 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [427 kB]
Get:33 http://archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages [381 kB]
Get:34 http://archive.ubuntu.com/ubuntu bionic-updates/main Translation-en [161 kB]
Get:35 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 DEP-11 Metadata [192 kB]
Get:36 http://archive.ubuntu.com/ubuntu bionic-updates/main DEP-11 64x64 Icons [89.9 kB]
Get:37 http://archive.ubuntu.com/ubuntu bionic-updates/restricted amd64 Packages [6,992 B]
Get:38 http://archive.ubuntu.com/ubuntu bionic-updates/restricted i386 Packages [6,928 B]
Get:39 http://archive.ubuntu.com/ubuntu bionic-updates/restricted Translation-en [3,076 B]
Get:40 http://archive.ubuntu.com/ubuntu bionic-backports/universe amd64 Packages [2,852 B]
Get:41 http://archive.ubuntu.com/ubuntu bionic-backports/universe i386 Packages [2,848 B]
Get:42 http://archive.ubuntu.com/ubuntu bionic-backports/universe Translation-en [1,200 B]
Get:43 http://archive.ubuntu.com/ubuntu bionic-backports/universe amd64 DEP-11 Metadata [5,104 B]
Get:44 http://archive.ubuntu.com/ubuntu bionic-backports/universe DEP-11 64x64 Icons [1,789 B]
Fetched 36.4 MB in 6s (3,336 kB/s)
(appstreamcli:2371): GLib-CRITICAL **: g_strchug: assertion 'string != NULL' failed
(appstreamcli:2371): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL' failed
(appstreamcli:2371): GLib-CRITICAL **: g_strchug: assertion 'string != NULL' failed
(appstreamcli:2371): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL' failed
(appstreamcli:2371): GLib-CRITICAL **: g_strchug: assertion 'string != NULL' failed
(appstreamcli:2371): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL' failed
AppStream cache update completed, but some metadata was ignored due to errors.
Reading package lists... Done
Building dependency tree
Reading state information... Done
Updating repository information
Hit http://archive.ubuntu.com/ubuntu bionic InRelease
Hit http://security.ubuntu.com/ubuntu bionic-security InRelease
Hit http://archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit http://archive.ubuntu.com/ubuntu bionic-backports InRelease
Fetched 0 B in 0s (0 B/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.
Restoring original system state
Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.15.0-38.41~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-38-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Mon Nov 12 14:32:11 2018
InstallationDate: Installed on 2018-11-09 (2 days ago)
InstallationMedia: Ubuntu 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-11-12 (0 days ago)
