Ubuntu 10.04 Serverにて。

コマンドでSambaをインストールするも、下記のエラー（？）で失敗します。
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sysadmin@TEST1:~$ sudo aptitude install samba
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done
Couldn't find any package whose name or description matched "samba"
Couldn't find any package whose name or description matched "samba"
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B of archives. After unpacking 0B will be used.
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done

sysadmin@TEST1:~$
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"sudo aptitude update"　"sudo aptitude dist-upgrade"や再起動実施後も同様です。
お忙しいところ申し訳ないのですが、アドバイスを頂きたいです。

よろしくお願いいたします。