Pretty sure this is fixed on Files 3.26 on Ubuntu 17.10. If you can reproduce the bug on a supported Ubuntu release (14.04, 16.04, or 17.10) or the development release (18.04) then, if the former, please post asking for the bug to be marked as affecting the relevant series (e.g. Xenial (for 16.04)) or, if the latter, please change the bug's status to 'New' and report upstream at https://gitlab.gnome.org/GNOME/nautilus/issues (though it's a problem that I'm unable to reproduce it).
** Changed in: nautilus (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nautilus in Ubuntu. https://bugs.launchpad.net/bugs/1513063 Title: trouble setting file association Status in nautilus package in Ubuntu: Fix Released Bug description: I want to set gedit as the default application for xml files. I alt-click an xml file, open properties, go to "Open With" tab. Chrome is the default for xml, I select "gedit" and press "Set as default". When I do, the selection goes back to Chrome and the file association remains with Chrome. I tested this on Ubuntu 14.10 and 15.04. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: nautilus 1:3.14.2-0ubuntu9 ProcVersionSignature: Ubuntu 3.19.0-31.36-generic 3.19.8-ckt7 Uname: Linux 3.19.0-31-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.17.2-0ubuntu1.7 Architecture: amd64 CurrentDesktop: Unity Date: Wed Nov 4 13:39:32 2015 EcryptfsInUse: Yes GsettingsChanges: b'org.gnome.nautilus.list-view' b'default-column-order' b"['name', 'size', 'type', 'date_modified', 'date_accessed', 'owner', 'group', 'permissions', 'mime_type', 'where']" InstallationDate: Installed on 2015-10-02 (32 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) SourcePackage: nautilus UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/1513063/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp