18.04->18.10: update-manager don't show upgrade page

I also have the same symptom.

Except I didn't run from a terminal, I just looked in /var/log/syslog:

Oct 24 18:39:37 snowplow update-manager.desktop[7753]: Checking for a new Ubuntu release
Oct 24 18:39:37 snowplow update-manager.desktop[7753]: Please install all available updates for your release before upgrading.

Here's an attachment illustrating the issue. This can happen if there are updates which are phasing but which are not installed on the system.

To clarify my last comment nautilus and unattended-upgrades both having a phasing percentage of 0 so won't appear in update-manager but are upgradable via apt so do-release-upgrade complains about not all updates being installed.

yes, i am facing exactly the same issue. I tried both through GUI button and the Terminal.. i have exactly the same issue.

I've put an updated version of ubuntu-release-upgrader in my PPA which should resolve the issue. Please install it and tell me how it goes, thanks!

https://launchpad.net/~brian-murray/+archive/ubuntu/ppa/+packages

Also, it would be nice that the GUI gives some feedback when it fails instead of just leaving you there staring at the computer

This bug was fixed in the package ubuntu-release-upgrader - 1:19.04.1

---------------
ubuntu-release-upgrader (1:19.04.1) disco; urgency=medium

  * DistUpgrade/{EOL,Devel}ReleaseAnnouncement,
    DistUpgrade/window_main.ui,
    data/gtkbuilder/DistUpgrade.ui,
    data/DistUpgrade.cfg,
    pre-build.sh:
    - updated for 18.10 -> 19.04
  * DistUpgrade/DistUpgradeController.py: check all the python symlinks and
    versions instead of the python one. Thanks to juliank for the assistance.
    (LP: #1799839)
  * do-release-upgrade: Do not block release upgrades if the installable
    updates are ones which are not fully phased. (LP: #1799710)

 -- Brian Murray <email address hidden> Wed, 31 Oct 2018 15:14:25 -0700

Hello DnsF, or anyone else affected,

Accepted ubuntu-release-upgrader into cosmic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/ubuntu-release-upgrader/1:18.10.11.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-cosmic to verification-done-cosmic. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-cosmic. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

Hello DnsF, or anyone else affected,

Accepted ubuntu-release-upgrader into bionic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/ubuntu-release-upgrader/1:18.04.28 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-bionic to verification-done-bionic. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-bionic. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

I was affected by the bug, found this bug report, followed the instructions to activate -proposed and used "sudo apt-get install ubuntu-release-upgrader-gtk/bionic-proposed" to update the python3-distupgrade, ubuntu-release-upgrader-core and ubuntu-release-upgrader-gtk packages, deactivated -proposed, tried updating, and the whole update process worked fine, but I got some Apport window that opened and complained about some bug just after clicking on the Update button, the one that previously didn't work. I'll include the error message that I got in the terminal.

On an Ubuntu 18.10 system I installed all available updates with update-manager and then ran 'do-release-upgrade -d' and was told I needed to install even more updates (gnome-software) before I could upgrade. I installed ubuntu-release-upgrader-gtk from -proposed and tried the process again w/o -proposed enabled. This time I was able to upgrade to the Disco Dingo!

I also tested the upgrade process from Ubuntu 18.04 to Ubuntu 18.10 and after installing the ubuntu-release-upgrader I was able to upgrade.

This bug was fixed in the package ubuntu-release-upgrader - 1:18.04.28

---------------
ubuntu-release-upgrader (1:18.04.28) bionic; urgency=medium

  * DistUpgrade/DistUpgradeController.py: check all the python symlinks and
    versions instead of the python one. Thanks to juliank for the assistance.
    (LP: #1799839)
  * do-release-upgrade: Do not block release upgrades if the installable
    updates are ones which are not fully phased. (LP: #1799710)

 -- Brian Murray <email address hidden> Thu, 01 Nov 2018 10:17:43 -0700

The verification of the Stable Release Update for ubuntu-release-upgrader has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

This bug was fixed in the package ubuntu-release-upgrader - 1:18.10.11.1

---------------
ubuntu-release-upgrader (1:18.10.11.1) cosmic; urgency=medium

  * DistUpgrade/DistUpgradeController.py: check all the python symlinks and
    versions instead of the python one. Thanks to juliank for the assistance.
    (LP: #1799839)
  * do-release-upgrade: Do not block release upgrades if the installable
    updates are ones which are not fully phased. (LP: #1799710)

 -- Brian Murray <email address hidden> Wed, 31 Oct 2018 16:15:17 -0700

@Jean-Alexandre - Thanks for testing this update. The error that you see is actually from update-manager and was fixed in https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1773316.

Hotfix which worked for me... move the /etc/apt/sources.list.d folder to another folder (like /home/user) and then try.