My option to install cmake 2.8.2 on ubuntu 9.10 and earlier version
cd /etc/apt
sudo nano source.list
comment all
and enter below
i use russian lang, you can choose the repository of other languages
###### Ubuntu 10.10
deb [url]http://ru.archive.ubuntu.com/ubuntu/[/url] maverick main restricted
deb-src [url]http://ru.archive.ubuntu.com/ubuntu/[/url] maverick main restricted
deb [url]http://ru.archive.ubuntu.com/ubuntu/[/url] maverick-updates main restricted
deb-src [url]http://ru.archive.ubuntu.com/ubuntu/[/url] maverick-updates main restricted
deb [url]http://ru.archive.ubuntu.com/ubuntu/[/url] maverick universe
deb-src [url]http://ru.archive.ubuntu.com/ubuntu/[/url] maverick universe
deb [url]http://ru.archive.ubuntu.com/ubuntu/[/url] maverick-updates universe
deb-src [url]http://ru.archive.ubuntu.com/ubuntu/[/url] maverick-updates universe
deb [url]http://ru.archive.ubuntu.com/ubuntu/[/url] maverick multiverse
deb-src [url]http://ru.archive.ubuntu.com/ubuntu/[/url] maverick multiverse
deb [url]http://ru.archive.ubuntu.com/ubuntu/[/url] maverick-updates multiverse
deb-src [url]http://ru.archive.ubuntu.com/ubuntu/[/url] maverick-updates multiverse
deb [url]http://extras.ubuntu.com/ubuntu[/url] maverick main
deb-src [url]http://extras.ubuntu.com/ubuntu[/url] maverick main
deb [url]http://security.ubuntu.com/ubuntu[/url] maverick-security main restricted
deb-src [url]http://security.ubuntu.com/ubuntu[/url] maverick-security main restricted
deb [url]http://security.ubuntu.com/ubuntu[/url] maverick-security universe
deb-src [url]http://security.ubuntu.com/ubuntu[/url] maverick-security universe
deb [url]http://security.ubuntu.com/ubuntu[/url] maverick-security multiverse
deb-src [url]http://security.ubuntu.com/ubuntu[/url] maverick-security multiverse
sudo apt-get update
sudo apt-get install cmake
cmake installed
source.list return to the original version!!!
sudo apt-get update
that it all
My installation log http://pastebin.com/EdPvuzEB