I was finally able to resolve this problem by unchecking/removing the entries for java in the webupd8team ppa, after manually installing the Oracle java-8-sdk using the procedures found in the following answer: https://askubuntu.com/questions/56104/how-can-i-install-sun-oracles-proprietary-java-jdk-6-7-8-or-jre After editing the repository using Synaptic Package Manager to remove all of the webupd8team java entries I used Software Updater to successfully update the system. Here is the terminal output from before and after the successful update: ---------- gnace@gn-limbo:~/Downloads$ java -version java version "10.0.2" 2018-07-17 Java(TM) SE Runtime Environment 18.3 (build 10.0.2+13) Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.2+13, mixed mode) gnace@gn-limbo:~/Downloads$ !! java -version java version "10.0.2" 2018-07-17 Java(TM) SE Runtime Environment 18.3 (build 10.0.2+13) Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.2+13, mixed mode) gnace@gn-limbo:~/Downloads$ sudo apt --fix-broken install [sudo] password for gnace: Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following additional packages will be installed: openjdk-8-jre-headless Suggested packages: fonts-ipafont-gothic fonts-ipafont-mincho fonts-wqy-microhei fonts-wqy-zenhei The following packages will be upgraded: openjdk-8-jre-headless 1 upgraded, 0 newly installed, 0 to remove and 836 not upgraded. 3 not fully installed or removed. Need to get 0 B/27.3 MB of archives. After this operation, 78.8 kB of additional disk space will be used. Do you want to continue? [Y/n] y (Reading database ... 531072 files and directories currently installed.) Preparing to unpack .../openjdk-8-jre-headless_8u212-b03-0ubuntu1.18.04.1_amd64.deb ... Unpacking openjdk-8-jre-headless:amd64 (8u212-b03-0ubuntu1.18.04.1) over (8u181-b13-1ubuntu0.18.04.1) ... dpkg: error processing archive /var/cache/apt/archives/openjdk-8-jre-headless_8u212-b03-0ubuntu1.18.04.1_amd64.deb (--unpack): trying to overwrite shared '/etc/java-8-openjdk/calendars.properties', which is different from other instances of package openjdk-8-jre-headless:amd64 dpkg-deb: error: paste subprocess was killed by signal (Broken pipe) Errors were encountered while processing: /var/cache/apt/archives/openjdk-8-jre-headless_8u212-b03-0ubuntu1.18.04.1_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1) [NB - following commands run AFTER using Synaptic Package Manager to edit Repository and Software Updater to successfully update the system] gnace@gn-limbo:~/Downloads$ cat /etc/apt/sources.list # deb cdrom:[Ubuntu 17.10 _Artful Aardvark_ - Release amd64 (20180105.1)]/ artful main restricted # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb http://us.archive.ubuntu.com/ubuntu/ bionic main restricted deb-src http://us.archive.ubuntu.com/ubuntu/ bionic universe restricted main multiverse #Added by software-properties # deb-src http://us.archive.ubuntu.com/ubuntu/ artful main restricted ## Major bug fix updates produced after the final release of the ## distribution. deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe restricted main multiverse #Added by software-properties # deb-src http://us.archive.ubuntu.com/ubuntu/ artful-updates main restricted ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team. Also, please note that software in universe WILL NOT receive any ## review or updates from the Ubuntu security team. deb http://us.archive.ubuntu.com/ubuntu/ bionic universe # deb-src http://us.archive.ubuntu.com/ubuntu/ artful universe deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe # deb-src http://us.archive.ubuntu.com/ubuntu/ artful-updates universe ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## multiverse WILL NOT receive any review or updates from the Ubuntu ## security team. deb http://us.archive.ubuntu.com/ubuntu/ bionic multiverse # deb-src http://us.archive.ubuntu.com/ubuntu/ artful multiverse deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates multiverse # deb-src http://us.archive.ubuntu.com/ubuntu/ artful-updates multiverse ## N.B. software from this repository may not have been tested as ## extensively as that contained in the main release, although it includes ## newer versions of some applications which may provide useful features. ## Also, please note that software in backports WILL NOT receive any review ## or updates from the Ubuntu security team. deb http://us.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse #Added by software-properties # deb-src http://us.archive.ubuntu.com/ubuntu/ artful-backports main restricted universe multiverse ## Uncomment the following two lines to add software from Canonical's ## 'partner' repository. ## This software is not part of Ubuntu, but is offered by Canonical and the ## respective vendors as a service to Ubuntu users. deb http://archive.canonical.com/ubuntu artful partner deb-src http://archive.canonical.com/ubuntu artful partner deb http://security.ubuntu.com/ubuntu bionic-security main restricted deb-src http://security.ubuntu.com/ubuntu bionic-security universe restricted main multiverse #Added by software-properties # deb-src http://security.ubuntu.com/ubuntu artful-security main restricted deb http://security.ubuntu.com/ubuntu bionic-security universe # deb-src http://security.ubuntu.com/ubuntu artful-security universe deb http://security.ubuntu.com/ubuntu bionic-security multiverse # deb-src http://security.ubuntu.com/ubuntu artful-security multiverse deb http://us.archive.ubuntu.com/ubuntu/ bionic-proposed main universe multiverse restricted deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-proposed main universe multiverse restricted #Added by software-properties gnace@gn-limbo:~/Downloads$ sudo apt --fix-broken install [sudo] password for gnace: E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable) E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it? gnace@gn-limbo:~/Downloads$ sudo apt --fix-broken install Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: libpyside2-5.11 libshiboken2-5.11 libsimgearcore2018.2.2 libsimgearscene2018.2.2 linux-headers-4.15.0-39 linux-headers-4.15.0-39-generic linux-image-4.15.0-39-generic linux-modules-4.15.0-39-generic linux-modules-extra-4.15.0-39-generic python-pivy python-pyside2.qtcore python-pyside2.qtgui python-pyside2.qtopengl python-pyside2.qtwidgets Use 'sudo apt autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. gnace@gn-limbo:~/Downloads$ java -version java version "10.0.2" 2018-07-17 Java(TM) SE Runtime Environment 18.3 (build 10.0.2+13) Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.2+13, mixed mode) gnace@gn-limbo:~/Downloads$ ----------