I'm trying to update my n900 to the latest firmware, which I recieved this morning. I've been reading in the threads etc so I've tried doing this

in x terminal:
apt-get clean
apt-get update
apt-get upgrade

But when I type it into x terminal this error comes up for all three:

"
E: Counld not open lock file /var/lib/apt/lists/lock - open (13 Permission denied)
E: Unable to lock the list directory
~ $"


Thanks.