Public bug reported: The package system is broken
Check if you are using third party repositories. If so disable them, since they are a common source of problems. Furthermore run the following command in a Terminal: apt-get install -f ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: update-manager 1:0.156.14.15 ProcVersionSignature: Ubuntu 3.2.0-55.85-generic-pae 3.2.51 Uname: Linux 3.2.0-55-generic-pae i686 NonfreeKernelModules: wl ApportVersion: 2.0.1-0ubuntu17.6 Architecture: i386 Date: Sat Mar 14 09:11:28 2015 DpkgHistoryLog.txt: DpkgTerminalLog.txt: GsettingsChanges: InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423) MarkForUpload: True PackageArchitecture: all ProcEnviron: LANGUAGE=en_US:en TERM=unknown PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: update-manager Symptom: ubuntu-release-upgrader-core UpgradeStatus: Upgraded to precise on 2015-03-14 (0 days ago) ** Affects: update-manager (Ubuntu) Importance: Undecided Status: New ** Tags: apport-bug i386 precise -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1432104 Title: iThe following packages have unmet dependencies: icedtea-7-jre-jamvm: Depends: openjdk-7-jre-headless (= 7u75-2.5.4-1~precise1) but 7u55-2.4.7-1ubuntu1~0.12.04.2 is installed Depends: zlib1g (>= 1:1.1.4) but 1:1.2.3.4.dfsg-3ubuntu4 is installed openjdk-7-jre: Depends: openjdk-7-jre-headless (= 7u75-2.5.4-1~precise1) but 7u55-2.4.7-1ubuntu1~0.12.04.2 is installed Depends: libjpeg8 (>= 8c) but 8c-2ubuntu7 is installed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1432104/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs