Debian squeeze installation issue
If you try to install ISPCONFIG on a Debian/squeeze server the installer aborts because is does not recognize the OS.
The next version of Debian is still in the testing phase and is not recommended for production server. But it will be out sometime soon. It's identification string in /etc/debian_version is squeeze/Sid.
Eventually install/lib/install.lib.php function get_distname() should recognize squeeze
Off course the workaround is simple. Just edit /etc/debian_version before you install ispconfig and change it back after ISCONFIG is installed :-)