*** This bug is a duplicate of bug 1611737 ***
https://bugs.launchpad.net/bugs/1611737
i am facing this issue as well. can't understand why though. i have
disabled all non ubuntu packages from apt source to the best of my
knowledge. any help is appreciated
karun@karunlindev3:~$ sudo do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]
Get:2 Upgrade tool [1,258 kB]
Fetched 1,259 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://us.archive.ubuntu.com/ubuntu xenial InRelease
Hit http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease
Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [107 kB]
Fetched 107 kB in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
Updating repository information
Get:1 http://us.archive.ubuntu.com/ubuntu bionic InRelease [242 kB]
Get:2 http://security.ubuntu.com/ubuntu bionic-security InRelease [83.2 kB]
Get:3 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Get:4 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Get:5 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages [1,019 kB]
Get:6 http://us.archive.ubuntu.com/ubuntu bionic/main i386 Packages [1,007 kB]
Get:7 http://us.archive.ubuntu.com/ubuntu bionic/main Translation-en [516 kB]
Get:8 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 DEP-11 Metadata
[477 kB]
Get:9 http://us.archive.ubuntu.com/ubuntu bionic/main DEP-11 64x64 Icons [245
kB]
Get:10 http://us.archive.ubuntu.com/ubuntu bionic/restricted amd64 Packages
[9,184 B]
Get:11 http://us.archive.ubuntu.com/ubuntu bionic/restricted i386 Packages
[9,156 B]
Get:12 http://us.archive.ubuntu.com/ubuntu bionic/restricted Translation-en
[3,584 B]
Get:13 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
[8,570 kB]
Get:14 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
[168 kB]
Get:15 http://security.ubuntu.com/ubuntu bionic-security/main i386 Packages
[134 kB]
Get:16 http://us.archive.ubuntu.com/ubuntu bionic/universe i386 Packages [8,531
kB]
Get:17 http://security.ubuntu.com/ubuntu bionic-security/main Translation-en
[63.6 kB]
Get:18 http://security.ubuntu.com/ubuntu bionic-security/main amd64 DEP-11
Metadata [204 B]
Get:19 http://security.ubuntu.com/ubuntu bionic-security/main DEP-11 64x64
Icons [29 B]
Get:20 http://security.ubuntu.com/ubuntu bionic-security/universe amd64
Packages [66.8 kB]
Get:21 http://security.ubuntu.com/ubuntu bionic-security/universe i386 Packages
[66.7 kB]
Get:22 http://security.ubuntu.com/ubuntu bionic-security/universe
Translation-en [39.3 kB]
Get:23 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 DEP-11
Metadata [6,844 B]
Get:24 http://security.ubuntu.com/ubuntu bionic-security/universe DEP-11 64x64
Icons [11.3 kB]
Get:25 http://security.ubuntu.com/ubuntu bionic-security/multiverse amd64
Packages [1,444 B]
Get:26 http://security.ubuntu.com/ubuntu bionic-security/multiverse i386
Packages [1,608 B]
Get:27 http://us.archive.ubuntu.com/ubuntu bionic/universe Translation-en
[4,941 kB]
Get:28 http://security.ubuntu.com/ubuntu bionic-security/multiverse
Translation-en [996 B]
Get:29 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 DEP-11
Metadata [3,287 kB]
Get:30 http://us.archive.ubuntu.com/ubuntu bionic/universe DEP-11 64x64 Icons
[8,420 kB]
Get:31 http://us.archive.ubuntu.com/ubuntu bionic/multiverse amd64 Packages
[151 kB]
Get:32 http://us.archive.ubuntu.com/ubuntu bionic/multiverse i386 Packages [144
kB]
Get:33 http://us.archive.ubuntu.com/ubuntu bionic/multiverse Translation-en
[108 kB]
Get:34 http://us.archive.ubuntu.com/ubuntu bionic/multiverse amd64 DEP-11
Metadata [49.7 kB]
Get:35 http://us.archive.ubuntu.com/ubuntu bionic/multiverse DEP-11 64x64 Icons
[225 kB]
Get:36 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
[328 kB]
Get:37 http://us.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages
[293 kB]
Get:38 http://us.archive.ubuntu.com/ubuntu bionic-updates/main Translation-en
[125 kB]
Get:39 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 DEP-11
Metadata [139 kB]
Get:40 http://us.archive.ubuntu.com/ubuntu bionic-updates/main DEP-11 64x64
Icons [56.9 kB]
Get:41 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe amd64
Packages [199 kB]
Get:42 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe i386
Packages [199 kB]
Get:43 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe
Translation-en [94.1 kB]
Get:44 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 DEP-11
Metadata [166 kB]
Get:45 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe DEP-11 64x64
Icons [290 kB]
Get:46 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64
Packages [4,180 B]
Get:47 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse i386
Packages [4,336 B]
Get:48 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse
Translation-en [2,740 B]
Get:49 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64
DEP-11 Metadata [2,468 B]
Get:50 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse DEP-11
64x64 Icons [2,638 B]
Get:51 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe amd64
Packages [2,852 B]
Get:52 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe i386
Packages [2,848 B]
Get:53 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe
Translation-en [1,200 B]
Get:54 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe amd64
DEP-11 Metadata [5,100 B]
Get:55 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe DEP-11
64x64 Icons [1,789 B]
Fetched 40.7 MB in 0s (0 B/s)
(appstreamcli:15961): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed
(appstreamcli:15961): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed
(appstreamcli:15961): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed
(appstreamcli:15961): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed
(appstreamcli:15961): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed
(appstreamcli:15961): 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.
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
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https://bugs.launchpad.net/bugs/1783372
Title:
upgrade from 16.04 to 18.04 not possible
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