Public bug reported: On Ubuntu 16.04.2: After installing xpdf it was not listed in the "Other Applications" list in "properties" -> "Open With" dialogue of a file.
So this may imply that there are multiple places managing the filetype <-> application relation. I had "PDF Mod" set as default appliction for pdf. After removing it from "Open With" -> "Other Application..." -> "Related Application" xpdf appeared in "properties" -> "Open With" -> "Default Apllication" but not in "Open With" -> "Other Application..." -> "Related Applications". In the first row of the right-click menu of the pdf-file the listed default application changed randomly between xpdf and something else. Clicking "Set as default" in the "properties" -> "Open With" after selecting one application let the xpdf disapear, unable to reselect it. My other nautilus bug reports may be related to this. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: nautilus 1:3.18.4.is.3.14.3-0ubuntu5 ProcVersionSignature: Ubuntu 4.4.0-72.93-generic 4.4.49 Uname: Linux 4.4.0-72-generic x86_64 NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia ApportVersion: 2.20.1-0ubuntu2.5 Architecture: amd64 CurrentDesktop: Unity Date: Tue May 2 00:58:14 2017 GsettingsChanges: b'org.gnome.nautilus.window-state' b'sidebar-width' b'253' b'org.gnome.nautilus.window-state' b'geometry' b"'890x522+1030+530'" SourcePackage: nautilus UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: nautilus (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug xenial -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to nautilus in Ubuntu. https://bugs.launchpad.net/bugs/1687497 Title: multiple default application settings conflicting To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/1687497/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs