unable to mount Sony PRS-600 with Linux as unprivileged user

[brainycat]

Unfortunately, I spoke too soon earlier today. I have discovered I am unable to mount my device as a user. I am able to mount both "main memory" and the SDCard as root. This is with version 0.6.29, the last version documented to work with glibc <2.9. I was able to mount the device filesystems as an unprivileged user with 0.6.19.

Perhaps related, I get errors with calibre-uninstall too:
root@galactica: /media
·*¬ calibre-uninstall
Invalid invocation of calibre loader. CALIBRE_CX_EXE not set

Additionallly, calibre_postinstall isn't clear if the udev rules installation was succesful:
root@galactica: /media
·*¬ calibre_postinstall
Creating symlinks...
Symlinking /opt/calibre/fetch-ebook-metadata to /usr/bin/fetch-ebook-metadata
Symlinking /opt/calibre/lrf2lrs to /usr/bin/lrf2lrs
Symlinking /opt/calibre/ebook-convert to /usr/bin/ebook-convert
Symlinking /opt/calibre/ebook-meta to /usr/bin/ebook-meta
Symlinking /opt/calibre/pdfmanipulate to /usr/bin/pdfmanipulate
Symlinking /opt/calibre/lrfviewer to /usr/bin/lrfviewer
Symlinking /opt/calibre/calibre to /usr/bin/calibre
Symlinking /opt/calibre/markdown-calibre to /usr/bin/markdown-calibre
Symlinking /opt/calibre/calibre-debug to /usr/bin/calibre-debug
Symlinking /opt/calibre/calibre-parallel to /usr/bin/calibre-parallel
Symlinking /opt/calibre/web2disk to /usr/bin/web2disk
Symlinking /opt/calibre/calibre-server to /usr/bin/calibre-server
Symlinking /opt/calibre/calibre-customize to /usr/bin/calibre-customize
Symlinking /opt/calibre/ebook-viewer to /usr/bin/ebook-viewer
Symlinking /opt/calibre/calibre-smtp to /usr/bin/calibre-smtp
Symlinking /opt/calibre/lrs2lrf to /usr/bin/lrs2lrf
Symlinking /opt/calibre/ebook-device to /usr/bin/ebook-device
Symlinking /opt/calibre/librarything to /usr/bin/librarything
Symlinking /opt/calibre/calibredb to /usr/bin/calibredb
Setting up bash completion...
Installing bash completion to /etc/bash_completion.d/calibre
Trying to setup udev rules...
Installing MAN pages...
Installing MAN page for ebook-meta
Installing MAN page for ebook-convert
Installing MAN page for web2disk
Installing MAN page for calibre-server
Installing MAN page for lrf2lrs
Installing MAN page for lrs2lrf
Installing MAN page for librarything
Installing MAN page for calibre-debug
Installing MAN page for calibredb
Installing MAN page for calibre-customize
Installing MAN page for pdfmanipulate
Installing MAN page for fetch-ebook-metadata
Installing MAN page for calibre-smtp
Setting up desktop integration...
Traceback (most recent call last):
File "/tmp/init.py", line 48, in <module>
File "/home/kovid/build/calibre/src/calibre/linux.py", line 570, in main
File "/home/kovid/build/calibre/src/calibre/linux.py", line 142, in __init__
OSError: [Errno 39] Directory not empty: 'conversion'


root@galactica: ~
·*¬ calibre-debug -d
USB devices on system:
[['0x54c', '0x31e', '0x31a', 'Sony', 'Sony Digital Book Reader'],
['0x1d6b', '0x2', '0x206', 'Linux 2.6.28.7 ehci_hcd', 'EHCI Host Controller'],
['0x1d6b', '0x1', '0x206', 'Linux 2.6.28.7 ohci_hcd', 'OHCI Host Controller'],
['0x1d6b', '0x1', '0x206', 'Linux 2.6.28.7 uhci_hcd', 'UHCI Host Controller']]
None
Looking for BEBOOK
Looking for BEBOOK_MINI
Looking for BLACKBERRY
Looking for CYBOOKG3
Looking for ILIAD
Looking for IREXDR1000
Looking for JETBOOK
Looking for KINDLE
Looking for KINDLE2
Looking for KINDLE_DX
Looking for NOOK
Looking for PRS505
Looking for PRS700
(1356, 798, 794, 'Sony', 'Sony Digital Book Reader')
Looking for PRS500
Looking for ANDROID
Looking for N770
Looking for N810
Looking for CYBOOK_OPUS
Looking for COOL_ER
Looking for ESLICK
Looking for NUUT2
Looking for IRIVER_STORY
Looking for POCKETBOOK360
Looking for GER2
Looking for ITALICA
Looking for SHINEBOOK
Looking for ECLICTO
Looking for EB600
Device possibly connected: PRS-600/700 Device Interface
Trying to open device... OK
Main memory: '/media/Sony Reader Main Memory (3)/'
Total space: (410689536L, 0, 3956801536L)


USER@galactica: ~
·*¬ calibre-debug -d
USB devices on system:
[['0x54c', '0x31e', '0x31a', 'Sony', 'Sony Digital Book Reader'],
['0x1d6b', '0x2', '0x206', 'Linux 2.6.28.7 ehci_hcd', 'EHCI Host Controller'],
['0x1d6b', '0x1', '0x206', 'Linux 2.6.28.7 ohci_hcd', 'OHCI Host Controller'],
['0x1d6b', '0x1', '0x206', 'Linux 2.6.28.7 uhci_hcd', 'UHCI Host Controller']]
None
Looking for BEBOOK
Looking for BEBOOK_MINI
Looking for BLACKBERRY
Looking for CYBOOKG3
Looking for ILIAD
Looking for IREXDR1000
Looking for JETBOOK
Looking for KINDLE
Looking for KINDLE2
Looking for KINDLE_DX
Looking for NOOK
Looking for PRS505
Looking for PRS700
(1356, 798, 794, 'Sony', 'Sony Digital Book Reader')
Looking for PRS500
Looking for ANDROID
Looking for N770
Looking for N810
Looking for CYBOOK_OPUS
Looking for COOL_ER
Looking for ESLICK
Looking for NUUT2
Looking for IRIVER_STORY
Looking for POCKETBOOK360
Looking for GER2
Looking for ITALICA
Looking for SHINEBOOK
Looking for ECLICTO
Looking for EB600
Device possibly connected: PRS-600/700 Device Interface
Failed to create mount point with error: Permission denied
Failed to create marker with error: No such file or directory
Failed to create mount point with error: Permission denied
Failed to create marker with error: No such file or directory
Trying to open device... failed
Opening of the following devices failed
<calibre.devices.prs505.driver.PRS700 object at 0x8b3d1ac>
Traceback (most recent call last):
File "/home/kovid/build/calibre/src/calibre/debug.py", line 111, in debug_device_driver
File "/home/kovid/build/calibre/src/calibre/devices/prs505/driver.py", line 63, in open
File "/home/kovid/build/calibre/src/calibre/devices/usbms/device.py", line 585, in open
File "/home/kovid/build/calibre/src/calibre/devices/usbms/device.py", line 561, in open_linux
DeviceError: Unable to mount main memory (Error code: 1)