Re: Toshiba tablet installation
Looked at the specs for your tablet -- that's really NICE!
So, if it was MY tablet, I would do the following BEFORE messing around with installing Ubuntu:
1) Go to the Android forums and the Phandroid forums
2) See if they have any sections dealing with your tablet
3) See if you can get help from them regarding how to image off your tablet in such a way that you can completely restore it to its current working state.
Since you can't (at present) boot from a Linux distro to see how well it works, forcing an install on the Tablet runs a high risk of turning it into a 10-inch glass placemat.
You should at least find out how to save and restore it so that, in worst case, you can get your working Tablet back.
Ubuntu 15.04 Mate, Mint 17.1; MS Win 8.1, Win10 TP.
Will not respond to PM requests for support -- use the forums.