OK, problem is solved. I have successfully installed Wine to run an open source application (Audacity) on my Mint 6 ( see the first post as to why). For anyone who has struck the same problem, and no internet access to simplify installation through Mintinstall, here's how simple it was, after pulling my hair out over the non-functioning ubuntu repository apps.
1) Go to the Wine HQ APT repository at http://wine.budgetdedicated.com
2) If you have an i386 system like me, choose the i386 version which is wine_1.1.15~wineq0~ubuntu~8.10-0ubuntu4_i386.deb.
It's right there on the screen, so you only have to click to download to a removable device like a USB stick.
3) Bring the file up on your desktop screen on the machine taking the install
4) Install as .deb file- Mint will give you the prompt on screen.
5) Put your disc with open source windows apps in the drive and bring audacity (or another app) to the screen, click to install and Hey presto, it's installed.
Note; this only worked because I had a disc of open source apps written for windows, which you can get from linuxcd.org. But it's seamless, even though I'm running a windows application; wine is working in the background to make it run. Thanks to the contributor who mentioned wine.budgetdedicated on this forum. Thanks doug. I get to keep my linux.