Public bug reported: kent@Dimension8300:~$ sudo do-release-upgrade [sudo] password for kent: Checking for a new Ubuntu release Get:1 Upgrade tool signature [819 B] Get:2 Upgrade tool [1,246 kB] Fetched 1,247 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 Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [109 kB] Hit http://us.archive.ubuntu.com/ubuntu xenial InRelease Get:2 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [109 kB] Hit http://ppa.launchpad.net/oibaf/graphics-drivers/ubuntu xenial InRelease Get:3 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB] Fetched 325 kB in 0s (0 B/s) Reading package lists... Done Building dependency tree Reading state information... Done Updating repository information Third party sources disabled Some third party entries in your sources.list were disabled. You can re-enable them after the upgrade with the 'software-properties' tool or your package manager. To continue please press [ENTER] Hit http://us.archive.ubuntu.com/ubuntu bionic InRelease Hit http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease Hit http://security.ubuntu.com/ubuntu bionic-security InRelease Hit http://us.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. 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 =================================== So I tried this: kent@Dimension8300:/var/log/dist-upgrade$ sudo update-manager -c --debug /usr/bin/update-manager:28: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded. from gi.repository import Gtk WARNING:root:can not import unity GI cannot import name Dbusmenu, introspection typelib not found Checking for a new Ubuntu release /usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcher.py:23: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded. from gi.repository import Gtk, Gdk /usr/lib/python3/dist-packages/DistUpgrade/ReleaseNotesViewerWebkit.py:33: PyGIWarning: WebKit2 was imported without specifying a version first. Use gi.require_version('WebKit2', '4.0') before import to ensure that the right version gets loaded. from gi.repository import WebKit2 as WebKit Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. authenticate 'bionic.tar.gz' against 'bionic.tar.gz.gpg' extracting 'bionic.tar.gz' (appstreamcli:7279): GLib-CRITICAL **: g_strchug: assertion 'string != NULL' failed (appstreamcli:7279): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL' failed (appstreamcli:7279): GLib-CRITICAL **: g_strchug: assertion 'string != NULL' failed (appstreamcli:7279): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL' failed (appstreamcli:7279): GLib-CRITICAL **: g_strchug: assertion 'string != NULL' failed (appstreamcli:7279): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL' failed AppStream cache update completed, but some metadata was ignored due to errors. --------------- Here a GUI window is displayed containing the above error message and a "Close" button:------------- 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'. --------------- And I'm returned to the command line. I suppose it would be nice to know what metadata was ignored due to what errors, but that error message is as helpful as a MS Windows error message... I checked main.log and the 4th line from the end has the only ERROR: kent@Dimension8300:/var/log/dist-upgrade$ cat main.log | grep ERROR 2019-04-10 17:49:16,631 ERROR Dist-upgrade failed: 'E:Unable to correct problems, you have held broken packages.' apt.log contains no errors, synaptic finds no broken packages, aptitude finds none, and /var/lib/dpkg/status contains nothing I can find that suggests a problem. After the first try (many before the ones above, I found a problem with cups-browsed, that synaptic and aptitude could not correct or reinstall, so I completely removed cups-browsed, tried again, and when that didn't help reinstalled it and tried again with the above (identical) results. I've lost count of how many times and different ways I've tried to get this upgrade to work. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: ubuntu-release-upgrader-core 1:16.04.26 ProcVersionSignature: Ubuntu 4.4.0-145.171-generic 4.4.176 Uname: Linux 4.4.0-145-generic i686 ApportVersion: 2.20.1-0ubuntu2.18 Architecture: i386 CrashDB: ubuntu CurrentDesktop: XFCE Date: Wed Apr 10 17:25:24 2019 EcryptfsInUse: Yes PackageArchitecture: all SourcePackage: ubuntu-release-upgrader UpgradeStatus: Upgraded to xenial on 2019-04-10 (0 days ago) VarLogDistupgradeTermlog: ** Affects: ubuntu-release-upgrader (Ubuntu) Importance: Undecided Status: New ** Tags: apport-bug dist-upgrade i386 xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1824247 Title: Upgrade from 16.04 to 18.04 fails. 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