Re: Must switch to Ubuntu in a hurry.
These days, iTunes music is unencrypted and will play in Ubuntu, although of course you can't use the iTunes store. There are lots of other worthwhile music stores that are cross platform.
Excel spreadsheets can be used.
Access databases can't be used, as far as I know.
I try to treat the cause, not the symptom. I avoid the terminal in instructions, unless it's easier or necessary. My instructions will work within the Ubuntu system, instead of breaking or subverting it. Those are the three guarantees to the helpee.