Definitely. Since minecraft is primarily Java based, it will run on almost any operating system.
Yes , all flash drives work on ubuntu
no
MagicJack does not support any Linux distribution, and will not work in Ubuntu.
Probably a revamp of the current Android version. If someone roots it, then you can install Ubuntu and play the Linux version of Minecraft... All we can do is hope!
Yes.
Nope
External NTFS drives will work with no problem with Ubuntu. Just plug in and use it.
Yes. It is included in the repositories of Ubuntu and Debian.
No, although the vast majority should.
Minecraft 1.4.6 mods will work with 1.4.7 sense they are both a 1.4.
Cheat Engine will not work on Ubuntu. However you can use scanmem and its graphical frontend GameConqueror.(which resembles Cheat Engine's interface)This does not mean cheating or "hacking" with this is in any way okay!
Xubuntu and Ubuntu are two different versions of Ubuntu. (Ubuntu has GNOME.)