Missing disc space on Ubuntu Hardy

I have a Dell Mini 10 running Ubuntu Hardy.

I ran out of disk space; looking at Disk Analyzer I noticed that in addition to the standard /dev/sda2 filesystem, there was a second called gfvs-fuse-daemon, each with 50% [5.9G] of my available disc space [11.8G]. Reading around a bit, it seems that gvfs has decided a network drive is in fact a root partition

https://bugs.launchpad.net/ubuntu/+source/simplebackup/+bug/227753

I unmounted gvfs-fuse-daemon, which removed it from the partition list but unfortunately didn't free up the 5.9G - I think it's somehow 'hidden' and would like it back as I am chronically short of space.

I'm certain this is related to plugging in a badly- formatted USB drive a couple of weeks ago. Reading the following

No free disk space

Out of disk space on 4GB partiton yet it's only using 2GB

it sounds like there may be a hidden file somewhere which needs deleting

I have run 'tune2fs -m 1 /var/sda2' to maximise what little space I have

Any assistance in cleaning up this mess would be gratefully received.

Thank you.

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jhw@jhw:~$ fdisk -l /dev/sda
Cannot open /dev/sda
jhw@jhw:~$ fdisk -l /dev/sda2
Cannot open /dev/sda2

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jhw@jhw:~$ df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda2 6123552 5517260 543080 92% /
varrun 512456 100 512356 1% /var/run
varlock 512456 0 512456 0% /var/lock
udev 512456 44 512412 1% /dev
devshm 512456 12 512444 1% /dev/shm
lrm 512456 1652 510804 1% /lib/modules/2.6.24-27
lpia/volatile

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jhw@jhw:~$ lsof +L1
COMMAND PID USER FD TYPE DEVICE SIZE NLINK NODE NAME
firefox 5438 jhw 37u REG 8,2 1544 0 97221 /var/tmp/etilqs_WxQgt6n5lgV3QoI (deleted)
firefox 5438 jhw 38u REG 8,2 1024 0 98379 /var/tmp/etilqs_fkODKeKm4ZOazIo (deleted)
firefox 5438 jhw 55u REG 8,2 0 0 98402 /var/tmp/etilqs_GUbgrLdlbap3xK7 (deleted)
jhw@jhw:~$