This is what happens when i give the command:
sudo do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]
Get:2 Upgrade tool [1,245 kB]
Fetched 1,246 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://archive.canonical.com/ubuntu xenial InRelease
Hit http://in.archive.ubuntu.com/ubuntu xenial InRelease
Get:1 http://in.archive.ubuntu.com/ubuntu xenial-updates InRelease [109 kB]
Hit http://in.archive.ubuntu.com/ubuntu xenial-backports InRelease
Get:2 http://in.archive.ubuntu.com/ubuntu xenial-security InRelease [109 kB]
Fetched 218 kB in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
Updating repository information
Get:1 http://in.archive.ubuntu.com/ubuntu bionic InRelease [242 kB]
Get:2 http://archive.canonical.com/ubuntu bionic InRelease [10.2 kB]
Get:3 http://archive.canonical.com/ubuntu bionic/partner Sources [1,900 B]
Get:4 http://archive.canonical.com/ubuntu bionic/partner amd64 Packages [2,320 B]
Get:5 http://archive.canonical.com/ubuntu bionic/partner i386 Packages [2,320 B]
Get:6 http://archive.canonical.com/ubuntu bionic/partner Translation-en [1,276 B]
Get:7 http://in.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Get:8 http://in.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Get:9 http://in.archive.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Get:10 http://in.archive.ubuntu.com/ubuntu bionic/universe Sources [9,051 kB]
Get:11 http://in.archive.ubuntu.com/ubuntu bionic/multiverse Sources [181 kB]
Get:12 http://in.archive.ubuntu.com/ubuntu bionic/main Sources [829 kB]
Get:13 http://in.archive.ubuntu.com/ubuntu bionic/restricted Sources [5,324 B]
Get:14 http://in.archive.ubuntu.com/ubuntu bionic/main amd64 Packages [1,019 kB]
Get:15 http://in.archive.ubuntu.com/ubuntu bionic/main i386 Packages [1,007 kB]
Get:16 http://in.archive.ubuntu.com/ubuntu bionic/main Translation-en [516 kB]
Get:17 http://in.archive.ubuntu.com/ubuntu bionic/main amd64 DEP-11 Metadata [477 kB]
Get:18 http://in.archive.ubuntu.com/ubuntu bionic/main DEP-11 64x64 Icons [245 kB]
Get:19 http://in.archive.ubuntu.com/ubuntu bionic/restricted amd64 Packages [9,184 B]
Get:20 http://in.archive.ubuntu.com/ubuntu bionic/restricted i386 Packages [9,156 B]
Get:21 http://in.archive.ubuntu.com/ubuntu bionic/restricted Translation-en [3,584 B]
Get:22 http://in.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages [8,570 kB]
Get:23 http://in.archive.ubuntu.com/ubuntu bionic/universe i386 Packages [8,531 kB]
Get:24 http://in.archive.ubuntu.com/ubuntu bionic/universe Translation-en [4,941 kB]
Get:25 http://in.archive.ubuntu.com/ubuntu bionic/universe amd64 DEP-11 Metadata [3,287 kB]
Get:26 http://in.archive.ubuntu.com/ubuntu bionic/universe DEP-11 64x64 Icons [8,420 kB]
Get:27 http://in.archive.ubuntu.com/ubuntu bionic/multiverse amd64 Packages [151 kB]
Get:28 http://in.archive.ubuntu.com/ubuntu bionic/multiverse i386 Packages [144 kB]
Get:29 http://in.archive.ubuntu.com/ubuntu bionic/multiverse Translation-en [108 kB]
Get:30 http://in.archive.ubuntu.com/ubuntu bionic/multiverse amd64 DEP-11 Metadata [49.7 kB]
Get:31 http://in.archive.ubuntu.com/ubuntu bionic/multiverse DEP-11 64x64 Icons [225 kB]
Get:32 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe Sources [240 kB]
Get:33 http://in.archive.ubuntu.com/ubuntu bionic-updates/multiverse Sources [4,612 B]
Get:34 http://in.archive.ubuntu.com/ubuntu bionic-updates/main Sources [272 kB]
Get:35 http://in.archive.ubuntu.com/ubuntu bionic-updates/restricted Sources [2,068 B]
Get:36 http://in.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [621 kB]
Get:37 http://in.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages [520 kB]
Get:38 http://in.archive.ubuntu.com/ubuntu bionic-updates/main Translation-en [231 kB]
Get:39 http://in.archive.ubuntu.com/ubuntu bionic-updates/main amd64 DEP-11 Metadata [276 kB]
Get:40 http://in.archive.ubuntu.com/ubuntu bionic-updates/main DEP-11 64x64 Icons [123 kB]
Get:41 http://in.archive.ubuntu.com/ubuntu bionic-updates/restricted amd64 Packages [6,996 B]
Get:42 http://in.archive.ubuntu.com/ubuntu bionic-updates/restricted i386 Packages [6,960 B]
Get:43 http://in.archive.ubuntu.com/ubuntu bionic-updates/restricted Translation-en [3,076 B]
Get:44 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages [945 kB]
Get:45 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe i386 Packages [932 kB]
Get:46 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe Translation-en [277 kB]
Get:47 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 DEP-11 Metadata [227 kB]
Get:48 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe DEP-11 64x64 Icons [395 kB]
Get:49 http://in.archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 Packages [6,644 B]
Get:50 http://in.archive.ubuntu.com/ubuntu bionic-updates/multiverse i386 Packages [6,788 B]
Get:51 http://in.archive.ubuntu.com/ubuntu bionic-updates/multiverse Translation-en [3,556 B]
Get:52 http://in.archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 DEP-11 Metadata [2,468 B]
Get:53 http://in.archive.ubuntu.com/ubuntu bionic-updates/multiverse DEP-11 64x64 Icons [2,638 B]
Get:54 http://in.archive.ubuntu.com/ubuntu bionic-backports/main Sources [2,532 B]
Get:55 http://in.archive.ubuntu.com/ubuntu bionic-backports/universe Sources [2,060 B]
Get:56 http://in.archive.ubuntu.com/ubuntu bionic-backports/main amd64 Packages [2,512 B]
Get:57 http://in.archive.ubuntu.com/ubuntu bionic-backports/main i386 Packages [2,516 B]
Get:58 http://in.archive.ubuntu.com/ubuntu bionic-backports/main Translation-en [1,644 B]
Get:59 http://in.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 Packages [3,712 B]
Get:60 http://in.archive.ubuntu.com/ubuntu bionic-backports/universe i386 Packages [3,716 B]
Get:61 http://in.archive.ubuntu.com/ubuntu bionic-backports/universe Translation-en [1,696 B]
Get:62 http://in.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 DEP-11 Metadata [7,224 B]
Get:63 http://in.archive.ubuntu.com/ubuntu bionic-backports/universe DEP-11 64x64 Icons [29 B]
Get:64 http://in.archive.ubuntu.com/ubuntu bionic-security/universe Sources [130 kB]
Get:65 http://in.archive.ubuntu.com/ubuntu bionic-security/multiverse Sources [2,744 B]
Get:66 http://in.archive.ubuntu.com/ubuntu bionic-security/main Sources [94.9 kB]
Get:67 http://in.archive.ubuntu.com/ubuntu bionic-security/restricted Sources [1,504 B]
Get:68 http://in.archive.ubuntu.com/ubuntu bionic-security/main amd64 Packages [365 kB]
Get:69 http://in.archive.ubuntu.com/ubuntu bionic-security/main i386 Packages [277 kB]
Get:70 http://in.archive.ubuntu.com/ubuntu bionic-security/main Translation-en [130 kB]
Get:71 http://in.archive.ubuntu.com/ubuntu bionic-security/main amd64 DEP-11 Metadata [14.9 kB]
Get:72 http://in.archive.ubuntu.com/ubuntu bionic-security/main DEP-11 64x64 Icons [20.9 kB]
Get:73 http://in.archive.ubuntu.com/ubuntu bionic-security/restricted amd64 Packages [4,296 B]
Get:74 http://in.archive.ubuntu.com/ubuntu bionic-security/restricted i386 Packages [4,280 B]
Get:75 http://in.archive.ubuntu.com/ubuntu bionic-security/restricted Translation-en [2,192 B]
Get:76 http://in.archive.ubuntu.com/ubuntu bionic-security/universe amd64 Packages [256 kB]
Get:77 http://in.archive.ubuntu.com/ubuntu bionic-security/universe i386 Packages [251 kB]
Get:78 http://in.archive.ubuntu.com/ubuntu bionic-security/universe Translation-en [144 kB]
Get:79 http://in.archive.ubuntu.com/ubuntu bionic-security/universe amd64 DEP-11 Metadata [35.8 kB]
Get:80 http://in.archive.ubuntu.com/ubuntu bionic-security/universe DEP-11 64x64 Icons [95.7 kB]
Get:81 http://in.archive.ubuntu.com/ubuntu bionic-security/multiverse amd64 Packages [4,004 B]
Get:82 http://in.archive.ubuntu.com/ubuntu bionic-security/multiverse i386 Packages [4,152 B]
Get:83 http://in.archive.ubuntu.com/ubuntu bionic-security/multiverse Translation-en [2,060 B]
Get:84 http://in.archive.ubuntu.com/ubuntu bionic-security/multiverse amd64 DEP-11 Metadata [2,464 B]
Get:85 http://in.archive.ubuntu.com/ubuntu bionic-security/multiverse DEP-11 64x64 Icons [2,638 B]
Fetched 55.3 MB in 6s (864 kB/s)
(appstreamcli:4220): GLib-CRITICAL **: g_strchug: assertion 'string != NULL' failed
(appstreamcli:4220): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL' failed
(appstreamcli:4220): GLib-CRITICAL **: g_strchug: assertion 'string != NULL' failed
(appstreamcli:4220): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL' failed
(appstreamcli:4220): GLib-CRITICAL **: g_strchug: assertion 'string != NULL' failed
(appstreamcli:4220): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL' failed
AppStream cache update completed, but some metadata was ignored due to errors.
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.
If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.If
you want to investigate this yourself the log files in
'/var/log/dist-upgrade' will contain details about the upgrade.
Specifically, look at 'main.log' and 'apt.log'.
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 1:16.04.26
ProcVersionSignature: Ubuntu 4.15.0-50.54~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-50-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Tue Jun 4 10:52:03 2019
InstallationDate: Installed on 2018-11-16 (200 days ago)
InstallationMedia: Ubuntu 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2019-06-04 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2019-06-04T09:43:02.818951
Thank you.
On Tue, 4 Jun, 2019, 9:35 PM Brian Murray, <email address hidden> wrote:
> *** This bug is a duplicate of bug 1611737 ***
> https:/
>
> ** This bug has been marked a duplicate of bug 1611737
> Can't upgrade from a release if ros packages are installed from ROS
> servers
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https:/
>
> Title:
> cant ugrade from 16.04 to 18.04
>
> Status in ubuntu-
> New
>
> Bug description:
> This is what happens when i give the command:
> sudo do-release-upgrade
>
>
> Checking for a new Ubuntu release
> Get:1 Upgrade tool signature [819 B]
>
> Get:2 Upgrade tool [1,245 kB]
>
> Fetched 1,246 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://
>
> Hit http://
>
> Get:1 http://
> kB]
> Hit http://
>
> Get:2 http://
> [109 kB]
> Fetched 218 kB in 0s (0 B/s)
>
> Reading package lists... Done
> Building dependency tree
> Reading state information... Done
>
> Updating repository information
> Get:1 http://
>
> Get:2 http://
>
> Get:3 http://
> B]
> Get:4 http://
> [2,320 B]
> Get:5 http://
> [2,320 B]
> Get:6 http://
> [1,276 B]
> Get:7 http://
> [88.7 kB]
> Get:8 http://
> [74.6 kB]
> Get:9 http://
> [88.7 kB]
> Get:10 http://
> [9,051 kB]
> Get:11 http://
> [181 kB]
> Get:12 http://
> kB]
> Get:13 http://
> [5,324 B]
> Get:14 http://
> [1,019 kB]
> Get:15 http://
> [1,007 kB]
> Get:16 http://
> [516 kB]
> Get:17 http://
> Metadata [477 kB]
> Get:18 http://
> Icons [245 kB]
> Get:19 http://
> Package...