When using "apt-get update" & "apt-get upgrade" I kept receiving errors such as:
"E: Sub-process /usr/bin/dpkg returned an error code (1)"
To fix this I changed my sources.list [located in "/etc/apt/sources.list"] to:
deb http://http.us.debian.org/debian/ squeeze main non-free contrib deb http://security.debian.org/ squeeze/updates main contrib non-free deb http://ftp.us.debian.org/debian/ squeeze-updates main contrib non-freethen used command:
"apt-get remove grub-legacy grub-common"
Fixed all issues and errors giving me problems. Just a share, submit corrections if needed