pcmanfm bookmark creation fails

Binary package hint: pcmanfm

I discovered this bug while (unsuccessfully) attempting to test for https://bugs.launchpad.net/ubuntu/+source/pcmanfm/+bug/635849 on Natty, but this is *not* a duplicate of that bug.

In this bug report, I use the term "bookmarks area" to designate the area in a PCManFM window that lists bookmarks.

In PCManFM 0.9.8 (package version 0.9.8-1, installed by lubuntu-desktop 0.19) on a 32-bit Ubuntu 11.04 Natty Narwhal Alpha 1 system, I tried to create a bookmark by dragging a folder's icon into the bookmarks area. This did not succeed. Furthermore, while holding the folder's icon over the bookmarks area, the pointer icon indicating that I was attempting to perform an impossible drag-and-drop operation showed.

In case it's useful, on this system the output of "uname -a" is:
Linux Gnar 2.6.37-7-generic #19-Ubuntu SMP Tue Nov 30 23:46:45 UTC 2010 i686 GNU/Linux

Manually added bookmarks (by modifying .gtk-bookmarks in the home directory) are still displayed and work correctly; they also can be renamed and removed without incident.

That was the only "workaround" I tried that worked--these workarounds did not:

(1) .gtk-bookmarks did not exist in my home directory, so I created it with default permissions (using /usr/bin/touch) and then tried again.

(2) After [1], I rebooted and tried again.

(3) I added a (valid) entry to .gtk-bookmarks, with the idea that PCManFM might be able to create a second entry, and tried again.

(4) I logged in remotely via ssh -X and ran pcmanfm. This was to create a PCManFM window belonging to a pcmanfm instance not run with the "--desktop --profile lubuntu" command-line arguments (this system runs LXDE). As expected, it still didn't work; however, this enabled me to see the debugging output. The console displayed these messages when I attempted to drag a folder into the bookmarks area:

** (pcmanfm:2079): DEBUG: device_added: /org/freedesktop/UDisks/devices/sda1
** (pcmanfm:2079): DEBUG: device_added: /org/freedesktop/UDisks/devices/sr0
** (pcmanfm:2079): DEBUG: device_added: /org/freedesktop/UDisks/devices/sda
** (pcmanfm:2079): DEBUG: device_added: /org/freedesktop/UDisks/devices/sda3
** (pcmanfm:2079): DEBUG: device_added: /org/freedesktop/UDisks/devices/sda2
** (pcmanfm:2079): DEBUG: device_added: /org/freedesktop/UDisks/devices/fd0
** (pcmanfm:2079): DEBUG: path: 4
** (pcmanfm:2079): DEBUG: path: 4
** (pcmanfm:2079): DEBUG: path: 4
** (pcmanfm:2079): DEBUG: path: 4
** (pcmanfm:2079): DEBUG: path: 4
** (pcmanfm:2079): DEBUG: drag_leave

In contrast, when I successfully add a bookmark via drag-and-drop in in PCManFM through a remote ssh -X login on a PCManFM 0.9.7 installation that works correctly (i.e. not the system suffering from Bug 635849), I get just this message instead:

** (pcmanfm:1962): DEBUG: FmJob error: No such file or directory

In case it's relevant, the correctly-functioning test machine is a 32-bit system running Ubuntu 10.10 Maverick Meerkat.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: pcmanfm 0.9.8-1
ProcVersionSignature: Ubuntu 2.6.37-7.19-generic 2.6.37-rc3
Uname: Linux 2.6.37-7-generic i686
Architecture: i386
Date: Sat Dec 4 07:26:39 2010
ExecutablePath: /usr/bin/pcmanfm
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20101202)
Pref_Config_System_Lubuntu:
 [Preferred Applications]
 WebBrowser=firefox.desktop
 MailClient=
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions:
 libmenu-cache1 0.3.2-2
 pcmanfm 0.9.8-1
 udisks 1.0.2-1
 gvfs 1.7.0-0ubuntu1
SourcePackage: pcmanfm