During much of the time I was running Ubuntu, I told myself that I’d be running Debian instead, if only I could get everything working. More here
I have Debian Multimedia in my /etc/apt/sources.list. I have working Flash and Java. On hardware of this age and specs (1.3 GHz Celeron and 1 GB RAM), you can feel the relative lightness of the GNOME environment in Debian as compared to Ubuntu.