Unable to install git

I ran the following commands on linux mint 12 lisa:

1). sudo rm -rf /var/lib/apt/lists/* -vf
2). sudo apt-get update
3). sudo apt-get install git

I am getting the following error on running 3. That is, installing git:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package git

My /etc/apt/sources.list file contains the following content:

deb http://packages.linuxmint.com/ lisa main upstream import
deb http://archive.ubuntu.com/ubuntu/ oneiric main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ oneiric-updates main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu/ oneiric-security main restricted universe multiverse
deb http://archive.canonical.com/ubuntu/ oneiric partner
deb http://packages.medibuntu.org/ oneiric free non-free

# deb http://archive.getdeb.net/ubuntu oneiric-getdeb apps
# deb http://archive.getdeb.net/ubuntu oneiric-getdeb games

sudo apt-get upgrade shows the following:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

Answer

You need to install aptitude first.

sudo apt-get install aptitude

then install git using the command

sudo aptitude install git