I work in telecommunications where I support TV, DSL Internet and landline phones. I worked as an IT consultant at a West African NGO where I migrated the entire NGO to using Ubuntu/Lubuntu. I've been using Ubuntu since version 7.04 and used every version since (mind you I skipped 10.04). My greatest troubleshooting accomplishments in Ubuntu include configuring the following peripherals:
- a USB CDMA modem
- parallel port scanner and commercial USB scanner (neither worked out of the box in Ubuntu 11.x)
- countless wireless adapters, at least three distinct ones via ndiswrapper
Without mentionning the countless tutorials I've followed online, troubleshooting my own problems, etc.
Nowadays I enjoy doing graphic work in GIMP and Inkscape, I don't need anything else.