Ubuntu – Ubuntu 18.04 failed upgrade from 16.04 LTS

18.04aptdependenciespackage-managementupgrade

I am using Ubuntu 16.04 LTS and I ran do-release-upgrade -d but
the upgrade failed with an error message saying packages have unmet dependencies.

sudo apt-get -f install and sudo apt update && sudo apt upgrade also failed to fix the errors.

Here is the full error message:

Correcting dependencies... failed.

The following packages have unmet dependencies:

 checkbox-converged : Depends: qtdeclarative5-ubuntu-ui-toolkit-plugin but it is not installable
 gnome-calendar : Depends: gsettings-desktop-schemas (>= 3.21.2) but 3.18.1-1ubuntu1 is installed

 gnome-session : Depends: gnome-shell (>= 3.25.91-0ubuntu4~) but it is not installed

                 Depends: gnome-session-bin (>= 3.28.1-0ubuntu2) but 3.18.1.2-1ubuntu1.16.04.2 is installed

                 Depends: gnome-session-common (= 3.28.1-0ubuntu2) but 3.18.1.2-1ubuntu1.16.04.2 is installed

                 Depends: xwayland but it is not installed

                 Recommends: fonts-cantarell but it is not installed

                 Recommends: adwaita-icon-theme-full

                 Recommends: gnome-themes-extra but it is not installed
 gnome-settings-daemon : Depends: libgnome-desktop-3-17 (>= 3.17.92) but it is not installed
                         Depends: gsettings-desktop-schemas (>= 3.20) but 3.18.1-1ubuntu1 is installed

 libc-dev-bin : Depends: libc6 (< 2.24) but 2.27-3ubuntu1 is installed

 libc6-dbg : Depends: libc6 (= 2.23-0ubuntu10) but 2.27-3ubuntu1 is installed

 libc6-dev : Depends: libc6 (= 2.23-0ubuntu10) but 2.27-3ubuntu1 is installed

 libqt5quick5 : Depends: libqt5core5a (>= 5.9.0~beta) but 5.5.1+dfsg-16ubuntu7.5 is installed

                Depends: libqt5gui5 (>= 5.9.0~beta) but 5.5.1+dfsg-16ubuntu7.5 is installed

                Depends: libqt5qml5 (>= 5.9.5) but 5.5.1-2ubuntu6 is installed

                Depends: qtbase-abi-5-9-5

                Depends: qtdeclarative-abi-5-9-5

 libunity-webapps0 : Depends: unity-webapps-service but it is not installable
 libwayland-egl1-mesa : Depends: libegl1 but it is not installed

 qml-module-qtquick-controls : Depends: libqt5qml5 (>= 5.9.5) but 5.5.1-2ubuntu6 is installed

                               Depends: libqt5core5a (>= 5.9.0~beta) but 5.5.1+dfsg-16ubuntu7.5 is installed

                               Depends: libqt5gui5 (>= 5.9.0~beta) but 5.5.1+dfsg-16ubuntu7.5 is installed

                               Depends: qtbase-abi-5-9-5

                               Depends: qtdeclarative-abi-5-9-5

 qml-module-qtquick-dialogs : Depends: libqt5qml5 (>= 5.9.5) but 5.5.1-2ubuntu6 is installed

                              Depends: libqt5core5a (>= 5.9.0~beta) but 5.5.1+dfsg-16ubuntu7.5 is installed

                              Depends: libqt5gui5 (>= 5.9.0~beta) but 5.5.1+dfsg-16ubuntu7.5 is installed

                              Depends: qtbase-abi-5-9-5

                              Depends: qtdeclarative-abi-5-9-5

 qml-module-qtquick-window2 : Depends: libqt5core5a (>= 5.9.0~beta) but 5.5.1+dfsg-16ubuntu7.5 is installed

                              Depends: qtdeclarative-abi-5-9-5

 qml-module-qtwebkit : Depends: libqt5core5a (>= 5.9.0~beta) but 5.5.1+dfsg-16ubuntu7.5 is installed

                       Depends: qtdeclarative-abi-5-9-5
 qml-module-ubuntu-test : Depends: qml-module-ubuntu-components but it is not installable

                          Depends: libubuntugestures5 but it is not installable

 qml-module-ubuntu-ui-extras-browser : Depends: qtdeclarative5-ubuntu-ui-toolkit-plugin (>= 1.3) but it is not installable or

                                                qtdeclarative5-ubuntu-ui-toolkit-plugin-gles (>= 1.3) but it is not installable

 qml-module-ubuntu-web : Depends: qtdeclarative5-ubuntu-ui-toolkit-plugin (>= 1.3) but it is not installable or

                                  qtdeclarative5-ubuntu-ui-toolkit-plugin-gles (>= 1.3) but it is not installable

 unity-control-center : Depends: libgnome-desktop-3-17 (>= 3.27.90) but it is not installed

                        Recommends: system-config-printer but it is not installed

                        Recommends: gnome-control-center-faces but it is not installed

 unity-webapps-qml : Depends: qtdeclarative5-ubuntu-ui-toolkit-plugin but it is not installable or

                              qtdeclarative5-ubuntu-ui-toolkit-plugin-gles but it is not installable

E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

E: Unable to correct dependencies

In addition, the GUI got somewhat strange.

What has happened?

Best Answer

This worked for me:

Open a terminal with: CTRLALTF1 (enter your user and password) then 

sudo apt install aptitude

next step

sudo aptitude install ubuntu-desktop gdm3

you will be offered options how to fix the incompatibilities, hit a few times N and ENTER until you are suggested with some removal of old packages and installing of updated one.

then give Y and ENTER to a solution that removes old incompatible packages and installs the new ones.

last 

sudo reboot

The above worked for me.

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