How do I fix a stuck gear shift in my Audi 80?

My Audi 80's gear shift seems to be stuck and I can't shift gears. What could be causing this issue?

Check to see if your brake lights are working properly. If not, it could be a faulty brake light switch causing the gear shift to become stuck.

Make sure your transmission fluid levels are adequate. Low fluid levels can cause gear shifting problems in your Audi 80.

Inspect the linkage between the gear shift and transmission for any damage or loose connections. This can cause difficulties in shifting gears.