sudo-apt-upgrade
$ sudo-apt-upgrade
(... loooots of other things.........)
(... and then suddenly ............)
Unpacking qml-module-org-kde-extensionplugin (5.36.0-0ubuntu1~ubuntu16.04~ppa1) over (5.18.0-0ubuntu1) ...
Preparing to unpack .../ruby2.3_2.3.1-2~16.04.11_amd64.deb ...
Unpacking ruby2.3 (2.3.1-2~16.04.11) over (2.3.1-2~16.04.9) ...
Preparing to unpack .../skypeforlinux_8.34.0.78_amd64.deb ...
Unpacking skypeforlinux (8.34.0.78) over (8.20.0.9) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for libc-bin (2.23-0ubuntu10) ...
Processing triggers for systemd (229-4ubuntu21.15) ...
Processing triggers for ureadahead (0.100.0-19) ...
Processing triggers for dbus (1.10.6-1ubuntu3.3) ...
Processing triggers for gnome-menus (3.13.3-6ubuntu3.1) ...
Processing triggers for mime-support (3.59ubuntu1) ...
Processing triggers for install-info (6.1.0.dfsg.1-5) ...
Processing triggers for fontconfig (2.11.94-0ubuntu1.1) ...
Processing triggers for ufw (0.35-0ubuntu2) ...
Errors were encountered while processing:
/var/cache/apt/archives/kio-extras_4%3a16.04.3-0ubuntu1~ubuntu16.04~ppa61_amd64.deb
/var/cache/apt/archives/kio-extras-data_4%3a16.04.3-0ubuntu1~ubuntu16.04~ppa61_all.deb
/var/cache/apt/archives/kaccounts-providers_4%3a16.04.3-0ubuntu1~ubuntu16.04~ppa61_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)