Dell System Update Utility is already running

So after a failed run of the Dell OpenManage Server Update Utility I found that I couldn't rerun the update. You can read my other post as to how this occured and how to download and run SUU. The error I was getting when trying to run SUU was as follows, and since I had just rebooted I knew no other instances were running.

[root@nkuvmhost4 cdrom]# sh suu -e
Another instance of SUU is already running. Hence exiting SUU application.....
If you are sure, no other instance is currently running on this system, then please refer
"Frequently Asked Questions" section in the user guide on how to start SUU

The cause was a file "/var/log/dell/suu/suu.lck" however deleteing this file was unsucesful even with "rm -f suu.lck".The reason it couldn't be renamed, moved or deleted was because is was being protected using extended file system 'i' attribute.

cd /var/log/dell/suu
lsattr suu.lck
----i-------- suu.lck

You can remove this with "chattr -i". Now you can remove the file like you would normally with "rm -f" with out any further issue.

chattr -i suu.lck
rm -f  suu.lck

Links
How to delete a write protected file