I have the same problem in a 64 bits Ubuntu 11.04. The problem seems related to Dropbox.
When Nautilus crashes, opening it from a terminal (with Dropbox opened) yields: emrys@emryslaptop:~$ nautilus ** (nautilus:15647): DEBUG: SyncDaemon already running, initializing SyncdaemonDaemon object Initializing nautilus-gdu extension Initializing nautilus-open-terminal extension (nautilus:15647): Gtk-CRITICAL **: gtk_action_set_visible: assertion `GTK_IS_ACTION (action)' failed (nautilus:15647): Gtk-CRITICAL **: gtk_action_set_visible: assertion `GTK_IS_ACTION (action)' failed Segmentation fault If I close Dropbox and try again, Nautilus opens without problems, just a bunch of messages ("(nautilus:16882): GConf-CRITICAL **: gconf_client_get: assertion `GCONF_IS_CLIENT (client)' failed") in the terminal, but no crash. -- 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/873987 Title: Nautilus crashes (segmentation fault) after upgrade to Ubuntu 11.10 Status in “nautilus” package in Ubuntu: Confirmed Bug description: I am encountering nautilus crash after upgrading to Ubuntu 11.10. THe file manager is totally unusable. Below is the terminal output :~$ nautilus Initializing nautilus-open-terminal extension Initializing nautilus-gdu extension ** (nautilus:6029): DEBUG: SyncDaemon already running, initializing SyncdaemonDaemon object (nautilus:6029): Gtk-CRITICAL **: gtk_action_set_visible: assertion `GTK_IS_ACTION (action)' failed (nautilus:6029): Gtk-CRITICAL **: gtk_action_set_visible: assertion `GTK_IS_ACTION (action)' failed Segmentation fault ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: nautilus 1:3.2.0-0ubuntu5 ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4 Uname: Linux 3.0.0-12-generic x86_64 ApportVersion: 1.23-0ubuntu3 Architecture: amd64 Date: Fri Oct 14 10:14:07 2011 InstallationMedia: Easylinux OS 0.7 "Project Delhi" - Release amd64 (20110521) ProcEnviron: PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: nautilus UpgradeStatus: Upgraded to oneiric on 2011-10-14 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/873987/+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