[mpich-discuss] apt-get install mpich

[Soheil Hooshdaran]

Hi.
As you told me I tyoed:
soheil at soheil-desktop:/media/TOSHIBA$ sudo nano /etc/apt/sources.list
[sudo] password for soheil:
soheil at soheil-desktop:/media/TOSHIBA$ apt-get install mpich
But got:
E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission
denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you
root?
soheil at soheil-desktop:/media/TOSHIBA$ sudo apt-get install mpich
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package mpich is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'mpich' has no installation candidate
soheil at soheil-desktop:/media/TOSHIBA$

What do I do now?
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