Comment 2 for bug 1764435

Note: same behavior even after dealing with the "kept back packages":

Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following NEW packages will be installed:
  linux-headers-4.15.0-15 linux-headers-4.15.0-15-generic linux-image-4.15.0-15-generic linux-image-extra-4.15.0-15-generic linux-tools-4.15.0-15
  linux-tools-4.15.0-15-generic networkd-dispatcher
The following packages will be upgraded:
  adwaita-icon-theme adwaita-icon-theme-full appstream autofs autofs5 ca-certificates cloud-image-utils command-not-found command-not-found-data cpp-7
  evolution evolution-common evolution-plugin-bogofilter evolution-plugin-pstimport evolution-plugins g++-7 gcc-7 gcc-7-base gcc-8-base gcc-8-base:i386
  gedit gedit-common gir1.2-gdesktopenums-3.0 gir1.2-goa-1.0 gir1.2-harfbuzz-0.0 gjs gnome-calendar gnome-contacts gnome-keyring gnome-keyring-pkcs11
  gnome-online-accounts gnome-settings-daemon gnome-settings-daemon-schemas gnome-todo gnome-todo-common gsettings-desktop-schemas language-pack-en
  language-pack-gnome-en language-selector-common language-selector-gnome lib32gcc1 lib32stdc++6 libappstream4 libasan4 libatomic1 libcc1-0 libcilkrts5
  libevolution libfreetype6 libgcc-7-dev libgcc1 libgcc1:i386 libgfortran4 libgjs0g libglib2.0-0 libglib2.0-bin libglib2.0-data libglib2.0-dev
  libglib2.0-dev-bin libgnome-todo libgoa-1.0-0b libgoa-1.0-common libgoa-backend-1.0-1 libgomp1 libharfbuzz-dev libharfbuzz-gobject0 libharfbuzz-icu0
  libharfbuzz0b libitm1 liblsan0 libmpx2 libnautilus-extension1a libnghttp2-14 libnss-myhostname libnss-mymachines libnss-systemd libobjc-7-dev libobjc4
  libpam-gnome-keyring libpam-systemd libpoppler-glib8 libpoppler-qt5-1 libpoppler73 libpython2.7 libpython2.7-dev libpython2.7-minimal libpython2.7-stdlib
  libqpdf21 libquadmath0 libsonic0 libstdc++-7-dev libstdc++6 libsystemd-dev libsystemd0 libtsan0 libubsan0 libudev-dev libudev1 libxen-4.9 libxen-dev
  libxenstore3.0 libyelp0 linux-generic linux-headers-generic linux-image-generic linux-libc-dev linux-tools-common linux-tools-generic nautilus
  nautilus-data ndiff nmap poppler-utils python2.7 python2.7-dev python2.7-minimal python3-commandnotfound python3-distupgrade python3-software-properties
  python3-update-manager qpdf snapd software-properties-common software-properties-gtk strace systemd systemd-container systemd-sysv ubuntu-docs
  ubuntu-drivers-common ubuntu-release-upgrader-core ubuntu-release-upgrader-gtk ubuntu-settings ubuntu-wallpapers ubuntu-wallpapers-artful
  ubuntu-wallpapers-bionic ubuntu-wallpapers-zesty ubuntu-web-launchers udev update-manager update-manager-core xserver-xorg-input-libinput yelp
143 upgraded, 7 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/244 MB of archives.
After this operation, 379 MB of additional disk space will be used.
Do you want to continue? [Y/n] n
Abort.