Hi guys can anyone advise on some soft I can user on my ubuntu system for dj mixing and scratching

Not sure if there are similar things like Acid Pro or E-Jay, it seems the biggest interest is (was?) towards Windows users..surely there is software for modifying audio, but I don't know of any that would be "specifically made" for DJs. Audacity is an audio recording and editing tool, see if you like; though I guess it's not what you're after.

The other thing is, I thought "real" DJs did the job with physical turntables and such, not with software. It is possible I know, but last time I checked, "software DJs" weren't too hot on the street -- or in other words, those who knew how to do cool things without semi-automatic software were more...umm..dope

there are not many programs about to do what you want.

i'm not sure how well the ones that are out there can handle scratching. But then i've not tried them so can't really comment on that.

a quick google search using "linux dj mixing software" in the search box gives search results.

one program that does look promising is http://www.mixxx.org/.

there is some very interesting stuff that can be done. I know that "Stanton" do i nice little device that you plug in to the audio system and use special records with a timing system encoded on to the track to control the software. I think you can use this with mixxx, but i also know that it does come with a windows program for it.