I am faced the same problem when I try to upgrade from 17.10 to 18.04, but after running the following commands, libp11-kit-gnome-keyring installed successfully, and my computer boot OK. So far, it is OK.
sudo apt-get remove --purge libp11-kit-gnome-keyring sudo apt-get install libp11-kit-gnome-keyring sudo dpkg --configure -a -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-keyring in Ubuntu. https://bugs.launchpad.net/bugs/1765504 Title: package libp11-kit-gnome-keyring 3.18.3-0ubuntu2 failed to install/upgrade: libp11-kit-gnome-keyring:all 3.28.0.2-1ubuntu1 (Multi-Arch: no) is not co-installable with libp11-kit-gnome-keyring which has multiple installed instances Status in gnome-keyring package in Ubuntu: Confirmed Bug description: error while upgrade! ProblemType: Package DistroRelease: Ubuntu 18.04 Package: libp11-kit-gnome-keyring 3.18.3-0ubuntu2 ProcVersionSignature: Ubuntu 4.4.0-119.143-generic 4.4.114 Uname: Linux 4.4.0-119-generic x86_64 NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia ApportVersion: 2.20.9-0ubuntu5 Architecture: amd64 Date: Thu Apr 19 14:58:45 2018 Dependencies: gcc-8-base 8-20180414-1ubuntu2 libc6 2.27-0ubuntu3 libgcc1 1:8-20180414-1ubuntu2 multiarch-support 2.27-0ubuntu3 ErrorMessage: libp11-kit-gnome-keyring:all 3.28.0.2-1ubuntu1 (Multi-Arch: no) is not co-installable with libp11-kit-gnome-keyring which has multiple installed instances InstallationDate: Installed on 2014-05-28 (1422 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-2 PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.14-4 RelatedPackageVersions: dpkg 1.19.0.5ubuntu1 apt 1.6 SourcePackage: gnome-keyring Title: package libp11-kit-gnome-keyring 3.18.3-0ubuntu2 failed to install/upgrade: libp11-kit-gnome-keyring:all 3.28.0.2-1ubuntu1 (Multi-Arch: no) is not co-installable with libp11-kit-gnome-keyring which has multiple installed instances UpgradeStatus: Upgraded to bionic on 2018-04-19 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-keyring/+bug/1765504/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
