Help! I've tried the instructions twice and get the same reults both times:
robin@deathstar-toshiba:~$ sudo apt-get install linux-tree
Reading package lists... Done
Building dependency tree... Done
E: Couldn't find package linux-tree
robin@deathstar-toshiba:~$
Here's my sources.list:
deb http://archive.ubuntu.com/ubuntu/ dapper main restricted
deb-src http://archive.ubuntu.com/ubuntu/ dapper main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu/ dapper-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu/ dapper-updates main restricted
## Uncomment the following two lines to add software from the 'universe'
## repository.
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
deb http://archive.ubuntu.com/ubuntu/ dapper universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ dapper universe multiverse
## Uncomment the following two lines to add software from the 'backports'
## repository. ## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
#deb http://archive.ubuntu.com/ubuntu/ dapper-backports main restricted universe multiverse
#deb-src http://archive.ubuntu.com/ubuntu/ dapper-backports main restricted universe multiverse
#deb http://security.ubuntu.com/ubuntu dapper-security main restricted
#deb-src http://security.ubuntu.com/ubuntu dapper-security main restricted
#deb http://security.ubuntu.com/ubuntu dapper-security universe multiverse
#deb-src http://security.ubuntu.com/ubuntu dapper-security universe multiverse
deb http://security.ubuntu.com/ubuntu dapper-security main restricted
deb-src http://security.ubuntu.com/ubuntu dapper-security main restricted
deb http://security.ubuntu.com/ubuntu dapper-security universe multiverse
deb-src http://security.ubuntu.com/ubuntu dapper-security universe multiverse
## dapper-commercial by canonical
## currently has realplay (realplayer 10) and opera (opera 9)
deb http://archive.canonical.com/ubuntu dapper-commercial main
## Cipherfunk multimedia packages (GPG key: 33BAC1B3)
#deb ftp://cipherfunk.org/pub/packages/ubuntu/ dapper main
#deb-src ftp://cipherfunk.org/pub/packages/ubuntu/ dapper main
## Bleeding edge (official) wine repository for Dapper
## only uncomment it if you need it
## deb http://wine.budgetdedicated.com/apt dapper main
## deb-src http://wine.budgetdedicated.com/apt dapper main
Also, there's nothing in /usr/src
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