>> probably do not support the hardware anymore). As new versions of Mac >> OS are no longer supported on this computer, would it be possible to >> install Debian Linux as the default OS on this machine
Without a doubt. Have you tried and encountered problems? A trivial search for "install debian imac" leads to https://wiki.debian.org/InstallingDebianOn/Apple >> (and would it be update able for a long time in the future)? Not sure what's "long" for you, but I'm running Debian testing on my 2006 mac-mini and my 2003 Thinkpad X30. Stefan
