Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package
This is may work by doing
#apt-get install updatebut if the above error repeats for this command too.. then.
System>Administration>Software sources (need root password)In third party software tab click add
In Debian software make sure download from is 'Main Server'deb http://http.us.debian.org/debian/ lenny main
close it. click Reload. (This is important)
Open a new terminal window (close the existing terminal if any)
run the apt command again. It will work !