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Similar situation here. My Dad uses his laptop for browsing and email, maybe to scan a document every few months. After getting fed up with all the calls about spyware and other generally weird issues I installed Ubuntu. Since then, I've had two support calls from him: 1) "Is it safe to enter my password when it's installing updates?" 2) "I'm at my friend's house... how do I add a new wireless network?"
Whilst it seems like a good idea to install Ubuntu on other peoples computers there are 4 things that would stop me from doing it. 1) Flash player, this crashes allot under Linux and seems to have some weird issues with sound where you will be listening to a video and all of a sudden the sound will start playing from the beginning of the video in addition to the current sound. 2) Wifi , this generally works, but Netw…
Network Manager is simply awful in my experience. I usually can't get it to work for myself. I configure the wifi directly and set an RC script for my mother's set-up. I think NM has gotten better recently, though.
You can set update manager to not check for a new version of Ubuntu.
Every once in a while there's hardware that doesn't work. I guess that's why I don't go around installing Linux on random people's computers. For my parents and girlfriend, though, it's worked very well - they all have become entirely used to Linux, and prefer it, and I see the opposite situation that we all know would happen if people were used to linux - they try Windows and complain about it because it's different and they don't know where everything is.