chattr -i FILENAME not working

[Arthur Bela]

Linux asdf 2.6.35-23-generic-pae #40-Ubuntu SMP Wed Nov 17 22:32:51
UTC 2010 i686 GNU/Linux

Distributor ID:	Ubuntu
Description:	Ubuntu 10.10
Release:	10.10
Codename:	maverick


# lsattr FILENAME
-----------------e- FILENAME

# echo "1" >> FILENAME
bash: FILENAME: Permission denied


Theres still a "lock" "sticker" on the icon [FILENAME], on the
desktop, like it would have immutable "on"

How could I "unset" the immutable bit? :O "chattr -i FILENAME"

Or I found a bug? :O

Thank you!