<sub>Disclaimer: feel free to edit</sub>

Other often recurring questions that lack the right information to be able to answer the question or judge whether it is a duplicate: <sub>[sorry, I don't have the time to write full use cases now, but maybe someone else has]</sub>

 - why does Ubuntu boot to a black/purple screen?
 - does Ubuntu support my hardware?
     * my GPU
     * my phone
     * my old computer with low hardware
     * the new supercomputer I want to buy
     * my TV
 - I have just installed Ubuntu and I have lost my data. How can I recover it?